Ah the bonus whoring days...miss them so dearly.
Watch your T&C's and cross your fingers they pay when/if you win. I've been banned so many times by so many casinos
back in the day, but the money was good. Had friends making a 5 figure monthly income on it. Nowadays, it's pretty much all dried up. Luck is your only option on heavy House EV games.
Learn the game of poker. Playing against the house is -EV for the player for sure. Play against other players and become better then them. Best chance at winning you'll get without a luck factor involved.