So,
@Redleg99 , how do we get from an 8 and 1/2 by 11" piece of notebook paper or a 12-inch paper plate at 5 yards, to the point where we're shooting like Tim Herron or Larry Vickers?
Earnest practice.
Admitting your shortcomings (oh, the puns....I am a dad, so dad-jokes are a part of my life!) is the first step: and you're already past this step!
Again, well done. Most folks can't see past this step.
Identifying your weaknesses is next. This is a bit harder, as none of us are there to watch you shoot, live. I think that given your past experience with firearms, you can likely do a little reading online and watch a few free YouTube videos and get a lot of good, usable info. to help you immediately get better, but before we go down that route, I want to ask to see if you have access to and are willing to enlist the help of your local firearms instructors.....
Shooting is a sporting endeavor, and as with any such, the help of a coach/trainer is imperative, and as we can see from the Olympic athletes on TV, at that level, individual coaching is almost mandatory.
Most local-level shooting instructors are either "been-there/done-that" type of former (or even active) military/law-enforcement, and/or are local/regional-level competition shooters (professional or not, no matter). Getting good instruction can really help give you an immediate boost so that you get much higher on the power-curve, faster, as well as serve to overcome any potential bad habits right from the start.
Particularly given today's ammo prices, paying for a few hours' of an instructor's time in a private, one-on-one session may really balance-out in your favor.
The best place to ask about such instructors would be via word-of-mouth either on your local/regional shooting Forum (be it for concealed carry or for competition shooting), at your local range, or, if you are willing to disclose your approximate location (nearest large city will often do, along with a mileage of how far you'd be willing to travel), even "national" Forums such as this one.
What you need now isn't a "run and gun" type of class. That'll come later - if you wish. Instead,
right now, it's about getting you dialed-in so that you are truly surgical at closer distances, and of acceptable accuracy/precision at-distance.
There are those who will argue that stacking rounds on top of rounds, particularly without the pressure of time, isn't necessary for defensive shooting. That "combat accuracy" is all that's needed.
While that is definitely true, the truth of the matter is that without the ability to shoot to an acceptable degree of accuracy/precision to begin with, once we start adding in time-pressure (the need to deliver multiple shots in rapid succession, within a very short window of time), dynamic movement (both you and the threat[ s ]), and physical pressure.....there's no way for that less competent shooter to actually achieve "combat accuracy," in the context of the actual fight - i.e. "combat accuracy" isn't flat-range.
What *_can_* you do, by yourself?
You can hold yourself to a higher standard - reel that target in until you are getting shots that stack on top of shots, and then start gradually increasing your distances while still holding yourself to that same standard. But also don't be afraid/embarrassed to push yourself - if nothing other than to "benchmark" your current performance so that you have a good reference of your actual progress.
Particularly as your current range limits your ability to draw from a holster and perform fast(er) follow-up shots, don't worry about these skills, yet. While both are important in the context of defensive shooting (the former of concealed-carry), neither are truly pertinent to where you want to first improve your skills.
Look now to establish those good handgunnery fundamentals. The rest will follow.
From the bottom up, build your stance, and align your lower and upper body presentations (here, I do not mean how you draw/"present" the firearm, rather, it's about how you are orienting yourself to the target, in a static, flat-range context). Keep in mind your natural point-of-aim while making the proper concessions towards getting a good "fighting" stance or balanced yet highly-mobile, athletic, stance (both of these latter are because your end-goal isn't static bullseye shooting, but rather that you are building the fundamentals here specifically towards a fight, with the use of a firearm). Remember, in the dynamic fight, you will likely never achieve your ideal stance or even upper-body presentation...but to zero-in on marksmanship, we need to first build these fundamentals from ideal. Bruce Lee wanted his students to flow like water - to have no form...but that doesn't mean that water isn't "elemental" in nature: you need those elements, now, first.
Once your stance and presentation have been established, next comes a solid, two-handed "freestyle" grip. This is where it all begins and all ends with the gun. The grip not only overcomes the compromises you've had to take with stance and presentation, but is also the starting point for sight alignment (i.e. "indexing"), recoil-management, and is the basis of your trigger path (improper indexing of the gun cascades into improper finger placement on the trigger, leading to a more difficult-than-necessary attempt to properly accomplish the trigger path).
Which, of-course, is the next thing: trigger management. Here, the idea is that the shooter is able to accomplish the trigger path and break the shot without disturbing the sight package.
A good stance/presentation, excellent grip, and proper management of the trigger path will have a good handgun shooter "ringing steel" (on a full-size torso target) all the way out to even the 40 to 50 yard line,
even without sights.
From there, we get to the finer aspects of marksmanship:
The sight package - sight alignment and sight picture - helps you refine your shooting. Take the above example, and get sights into the equation, and you're now shooting "surgically" instead of "minute-of-man." You go from the broad side of the barn to the barn doors and then to the nail that's holding the wood together.
Breathing/follow-through/recovery then offers even more refinement. Here, we understand that your "group" on the target downrange isn't achieved by "shooting a group," but rather is simply a manifestation of a series of what are otherwise
individually PERFECT shots. We take one shot at a time, keeping in mind the principles that as J. Michael Plaxco espoused: "Accuracy over Speed," and that "Sights Dictate Cadence."
At any distance, and at every cadence, what I'm looking for is to literally stack every subsequent shot on top of the first - that "one-hole-group."
Whether if I can achieve that? That's a totally different story.
But that's what I'm shooting for! I'm on the path, myself, and I'm still a student, just like you!