I would advise you a few things:
1. Study randomness and probability of the game
2. If you feel that a particular way of playing or a particular bet can make you a winner, try to simulate that long enough. I would advise doing 100 sessions of 1000 spins each. If your method has a sound reasoning, it will come out as a winner. If it doesn't, try to find reasons of your losses.
3. Stay out of fallacies and fallacy mongers. Many players can still advise you to play martingale, which is the worst joke of the game. In the best case, you earn 1 unit and in the worst case you lose thousands. 1 loss may take you forever to recover.
Best of luck.