Hmm, there isn't much you can do to change your fate during a slots section. In my opinion the best a gambler can do is to try predicting what will come next, changing his bet size accordingly. When I play facing several consecutive losses roll after roll, I tend to increase my bet meanwhile, because the more you lose consecutively, the higher are the chances you will win something on the next roll and once I hit something good enough to recover my bankroll I decrease my bet again.

But it's not martingale, because I'm not doubling my bets after every loss. Anyway, nobody should do this continuously without a limit. Always start playing with a goal: if you win X btc, quit the game or if you lose Y btc quit the game as well. It's very important to not change this goal during a game session.