Also, it's a very risky path to take. If you made an error in your assumptions about your open source investment, tech stack choice, etc, then you won't see any good return, but you burned through your savings.
Contribute to something that has gotten big, quickly.
I chose Rails 14 years ago and have been riding that train ever since.
If I were choosing a new space and starting out, I’d contribute to Kubernetes. Lots of need in that space and I’m sure you could demand top dollar once you have a few merged PRs under your belt.