have you ever tried any of these strategies before? were you successful?
the old trick of increasing the bet after a loss. Yes, I've tried those strategies and, at first, they seem to work. You achieve a small increase in your balance and feel on top of the world. But as you mentioned, everything collapses when the losses pile up. A losing streak and your bets start growing exponentially, devouring your entire balance. In summary, I've tried it, but I wouldn't recommend relying on them to win consistently. It's very difficult to beat the casino; you need luck and patience, as I doubt there's a systematic trick where you win 100% of the time. That would be the holy grail for gamblers.
Or start with just a small bet, and just like hit it in auto for at least 5-20 spins and then increased the size of the bet. I will admit that I do did this strategy and hit a bonus round but it didn't give me anything.
So it's all about luck still, there is no safe strategy when you are playing slots that is very volatile and unstable. We even have threads about losing streak and some game provider that is giving us gambler nothing and very dry.
So no, I won't follow those kind of strategies anymore and if I won the bonus, it's just about luck nothing less.