That's pretty difficult to obtain. For typical creative passions, you need to be in the top 1% for them to sustain you.
I am into product development, particularly products that are what I would call “full stack.”
Electronics, firmware, software, and web stack all developed for the product.
If, on the other hand, you're passionate about software development and electronics, then it's a very common passion and you have to be in the top 1% to make a living out of your creations. Of course, there are subniches with various degrees of difficulty - it's easier to make money on some technically simple B2B SaaS than on consumer robots for example.
I don't understand your point. Isn't there a massive chunk of people who are passionate about "software development and electronics" that make a living off of it?
Then again I’ve rarely had the discipline to stay put and make a short term sacrifice for long term gain when it comes to my daily work.
It is critically important to me to be fulfilled daily in my work and explore my ideas and passions.
To me, even if I was never financially well off, but I got to pursue my passions and creativity, that would be a life well spent.
Remember, the journey is the reward, not the end.
Disclaimer: I am a college drop out, couldn’t even be patient long enough for that.