here is a bit of advice from someone who is still trying to fix his own game that finally sunk in even though I was told and read several hundred times, and is helping me a lot.
Pick one thing you want to fix the most, swing, timing ,balance whatever and work on that and only that until it is automatic unlike me achieve it once or twice in practice and move on.
Also when working on it dont worry about where your ball goes and what your score is thats why its called practice (for me was most difficult part) you will know by feel if it is right.
For me I am working on straight free swing which by fixing it other things are fixing themselves like balance and release point.
Once I have achieved that, which is taking a lot longer than I imagined. I am moving on to my release and wrist position. So for now I am not worrying about revs, hooking 38 boards, stringing strikes or being the best practice bowler in the house. And you know what? I am enjoying practice more and my game is getting better because of it.
Keep up the good work,