I would hit the micro stakes for sure with $50 bankroll. You have options based on your playstyle and what works best for you. You can go to the .01/.02 cash games, tournaments up to $2, or sit n gos for $1.50. I also recently discovered jackpot games, which is basically the same as
pokerstars spin n gos if you are familiar. I feel like I have an advantage in short handed play and have had quite a bit of success in those lately. The good news with ACR, is there are a lot of good options for low stakes players like yourself depending on what modes you like best.
Don't be afraid to try the freerolls and venom steps. Yes there is some bad play there, but bad players are always easier to beat than good players. Sure you'll run into weird stuff like a guy hitting 2 pair with 5 7 offsuit on a 3bet preflop once in a while, but that style of play is super exploitable and should be easy to beat.