Suggestions for a child’s portfolio

I have been trying to learn about the stock market for the last few months, but I want to make sure I’m not doing anything dumb. I put $5000 in a custodial account for my 8 year old.

I have put $1000 into QQQ, $1000 into SPY, and $300 into DIS but considering adding more.

My dad has been very successful in the stock market for decades, and he recommended NLY, SNOW, and MSFT among a few others.

Any other suggestions? I’d also like to add a few riskier options.

My son won’t have access to it until he’s 21, so about a 13 year hold, hopefully longer.