I used to follow a bunch of forum threads about betting systems a couple of years ago, trying out everything from Martingale on roulette to tracking specific slot RTPs. After tracking every single session on a spreadsheet for six months, the numbers made it pretty clear that variance will always win out in the end. You might hit a great streak that lasts a few weeks, but the math is designed so the casino keeps its edge over a large enough sample size. These days I just drop twenty bucks on live dealer games once a month during football games, accept that the money is basically spent on entry, and log off the second that initial balance hits zero.