Suppose we are talking about some exam, you make a strategy, study smartly, solve old papers and you will secure good marks. Here practice and dedication has its effect unless the paper goes highly out of syllabus bounds.

Now when we come to gambling, every game is different from the previous one, there are no methods to outsmart the system and the more you "practice" the poorer you become, because it is made to be like that only.

So for EV- games, no strategy will ever work, just cash out while still in green. For EV+ games, I have my doubts, but it is safe to assume that the long term outcome is loss.