You should really be looking for "Where can I get work for what I already know?" The single most important element of business is paying customers. Feeling like you need to learn more before you can get paying customers is a potential infinite loop of excuses for why you can't go to market yet . After high school, there is college. After your bachelor's degree, you can pursue a master's. After that, you can get a PhD…
While I mostly agree in principle, there are some counter-examples as well - people who mostly just played with personal projects who got hired at $300k jobs for the niche skills they've gained. These people are top-notch though.
I want Sven's life. But most of us don't live like that. We have to work at figuring out how to make money.