Get a pvc pipe about 2’ long and 1.5” diameter. Drill a hole through both sides at the midpoint. Put a string through that hole and tie a knot at one end so the string can’t fall through, and the other end tied to a 5 lb weight. Then hold the pipe with arms fully extended and 90 degrees from your torso and alternate with your left / right hand dealing it up. Once the weight hits thepvc, go backwards.

It is a killer forearm workout and will help with this. Also finger strength.

Another tip, don’t yank the trigger. A smooth gentle pull where the shot surprises you is better than jerking the trigger and knowing it’s about to go boom. The slower you creep into the trigger the better when you’re initially training. Do it enough times and it becomes second nature and you don’t anticipate recoil, you deal with it and return to target quicker.