Hey there's quite a bit of online opportunities that you can do, but it all depends on how much money you have and how much risk you want to take.
There's generally a tradeoff between how much time it takes to start getting traction vs. how much financial risk you want to take.
For example, you can do e-commerce which has a decent amount of financial exposure, but doesn't take as much time to set up and maintain as, say, building a software to sell.
You can also do service arbitrage where the financial risk is low but you need to be able to spend a lot of time translating what your client wants to your contractor.
You can make stuff digital items on Etsy, which requires no financial risk but takes a ton of time.
And a lot more ideas...each with their own risks and tradeoffs.
Not to shill my own website but I write about quite a few online ideas I've personally had experience with here: https://goodmoneygoodlife.com/...arning/misc-tactics/