I don't how you define high volatility, but if you mean 30-70% daily (or more), then you should start with new coins that enters the market, specially meme.

Everyday there are at least 10-20 coins you can choose.

I do this the last weeks. It's extremely fun, but super risky. I got scammed 3 times, i lost some money in big dumps, but i was lucky enough to buy some coins before the big pump. Anyway, i gained some profits, but not much.

Gambling in casino is less risky i think, nevertheless i like it