You cannot make more money on roulette or slots. It's all luck.
There no strategies that work.
In betting, you can follow statistics and form etc. and eventually make a good value bet. But of course it is not 100% that your bet will work out, but if you know bankroll management and if you stick to your strategies you will make money in the long run, and that what is successful gambling all about.
Not playing slots and hoping for a luck, making most in one sitting etc.
And with AA you have 81% to win pre-flop, so you will lose 1 out of 5. Nothing so exceptional. There are WAY worse bad beats.