Definitely. Not saying don't put money in ETFs but the returns aren't as fast and you have to earn a good salary to do so.
However adding some money into the market leaders would be a wise idea IMO. I.e. TSLA and AAPL. Since you are in the ETF ($SPY) for now then you are already invested in AAPL as it's the largest portion of it so adding TSLA which is going to be $5,000 in a decade would be wise.
