How much should I be investing into qqq? 26 yr old. I set about $100 a month for investing.

I really like QQQ because it beat out the S&amp;P 500 the past 10 years, but it seems risky and the whole “don’t predict based on past performance” and what not.

How much should I risk on QQQ? 

(Also have it as 30% of my M1 portfolio)