Shave your beard and go clean-shaven and do everything you can to look good or at least decent.
Seriously, beards are for soy bugmen or unironic Jake Alley/MovieBob-tier basement dwellers especially if you're a Millennial or Zoomer.
Don't wear any obvious geek merch, at least when you're just dating. Not even the "normie" geek stuff like Star Wars or Marvel. Honestly, I'd say Marvel/Star Wars/Nintendo be even worse than weeb merch by this point, since it screams "soy bugman/male feminist Nice Guy sex pest" in 2020, especially when combined with a beard (or worse, a beard and glasses)
Hide your goddamn power level on the first date, and wait until you get to know the person beforehand before you admit to liking geek stuff.
Also, avoid online dating sites unless you want to aim low and go for a one-night stand and if you just want someone to fuck, you're better off just going all out and hiring a hooker anyway.
Still, you should go clean-shaven, keep clean, and look presentable anyway. That's just common sense good advice for any guy in any situation.