"...............overall more versatile shooter".
Now here's a man after my own heart !!!!
I have a number of drills slanted toward hunting, but I hold my own at 3d shoots too. Bear in mind that I shoot A LOT. Probably average 50 arrows a day, analyzing every shot made and planning the next.
Suggestions;
(1) Join an archery club. The exchange of ideas alone is worth the yearly dues.
(2) Go to some 3d shoots. If you're concerned that the 'big boys' will see you making mistakes, keep in mind that the big boys have already made all of those mistakes. I once told a newbie "I DEFY you to do something stupid that I haven't already done, probably more than once". The big boys all understood.
(3) Bales ............. are for working on form, by the numbers, marked yardage from where you're comfortable. Take your time and think about every shot. Don't just shoot a lot of arrows. Think about what you're doing.
(4) Paper plates....... with a square of hot pink duck tape in the center makes a great target. Before you're done shooting for the day, do the walk-back. Start at 5 yards & shoot one. If it hits, move back to 10 yards. If you hit the plate, go to 15 yards. So on until you miss one. Now you have a goal for the next session.
(5) Point on ............... is your friend. Flaws in your form will show up at your point on distance. The point of your arrow is as good as a sight pin. (A fat sight pin, but still a pin.) Unless you change bow weight, arrow size or your string is getting ready to fail, your point on distance should remain the same. Shoot good form and shoot good groups.
(6) If you can shoot groups at point on distances, close range hunting distances should look like chip shots. Confidence is a big deal when it comes to hitting what you're aiming at.
(7) Roving !!!! Gotta love roving / stump shooting. Alone is good, with a couple of buddies is even gooder. Teaches distance estimation and shooting under pressure for bragging rights. If you can do your roving where there's grouse or cottontails so much the better !!!!
(7) Stay hungry. In the August 1968 Archery World magazine, Jack Witt wrote, "An archer shoots as good as what he himself is satisfied with shooting." Once you decide that good enough is good enough, you ain't gonna get no better.