Depends on your overall risk appetite. There is an ocean of investment opportunities.
You could, like you’ve already done, invest into index funds, long term.
Maybe consider learning the craft of trading yourself and potentially make it even more rewarding.
Since you are seemingly looking for passive investments/income, you could consult with a professional trader to trade on your behalf.
Depending on the individual, this can be extremely rewarding.
Definitely worth looking into. Has served me personally pretty well.