Invested in only ETFs. Do I need to do anything else?

I'm 21 and I've been aggressively investing in ETFs for about 3 years now. I'm curious about next steps.

Should I continue investing in ETFs? Should I deviate and consider stock picking?

And if I should pursue the latter, how do you pick your stocks? What has worked for you and what hasn't? What are the best channels to educate yourself about certain companies and overall market trends?

I'd love to hear any thoughts! Thank you. :)