Are QQQ and ARKK good ETF options for a 27 yr old? What are your opinions on these ETFs?

I invested in it and never regretted.

Even, when recognizing their excellent past performance (which not necessarily is a predictor for future performance) they are classifiable as high risk.

better diversified choices would be MSCI World ETF, MSCI ACWI ETF or a 50/50 % mixture of VUSD and MCHI​​​