Getting old helped me.
Sounds silly but it makes since. I use to be young, and active him humping rucks and cross country skiing.
I'd chase critters through the woods, tracking and trying to sneak up on critters.
I use to be sneaky. I was chosen to test the security of the guard shacks during the early Alaska Pipe Line days and was pretty good.
As I got old and lazy I got to where I spend more time setting and glassing, and found I see and harvest more game.
I don't care how sneaky you are its not that easy to sneak up on critters, they can hear and smell a lot better then we can.
Trapping is good, I use to trap as a kid, before and after I moved to Alaska and even now help my son who is into trapping. I can find tracks and trails but I don't often see the critters I trap until I trapped them. Except for muskrats and coons, which I shot, the rest of the critters I never saw out of the traps.
As to shooting critters once seen, its hard to beat Prairie dog or other varmint hunting. In fact the AMU in their LE Sniper Manuel suggested varmint hunting as the best practice one can do for counter sniping. It gives you angles, wind, light, direction and environmental challenges you'll get hunting afield.
Patience, camo, are important for blinds or glassing a hill side. Try calling turkeys, they are leery critters. Hiding in brush helps too. One of my first jobs as a kid was killing crows out of farmers corn fields for 25 cents a piece. I had my best luck falling asleep in black berry bushes over looking a corn field. If I watched they didn't come because I fidgeted. If I went to sleep, they were all over the place when I woke up.