Gamble stocks for .5% position(s). DASH, UBER, CRWD?

I've got about 18 blue chips for the bulk of my portfolio and QQQ and some VTI in my other account.

I'm thinking of some small high risk, high reward type stocks to add some volatility for small positions as to not sway the portfolio much but mostly for fun and to average down slowly in.

I don't want meme crap but companies that are legitimately doing well but are beaten down etc.

I do have a small position in INMD that I'm doing the same in.

Yesterday, I see that Door DASH did well. Uber also? CRWD I had and got rid of but it's getting tempting for a few shares at 130 now.

So opinions on starting small position(s) in either UBER, DASH mostly?

Thanks