it became tiresome to me after dealing with systems carrying lots of technical debts from past developers. I got burnout in the past, depression came from anxiety which, in turn, came from that very burnout.

I have much the same problem, however,

it became tiresome to me after dealing with systems carrying lots of technical debts from past developers.

This could be your opportunity to build a SAAS product the way you want, such that you can fully minimize that technical debt. I don’t know about you, but I get energized by the idea of doing things “the right way”, and in ways that benefit my own workflows and ideals.

Furthermore, for IT positions, professional networking is a must, something that, as an introvert, I didn't really build. So when I apply for a job vacancy, I'm just another "anybody" in the eyes of that business.

This is where building your own product allows you to bypass all this. Granted, once you crank out your absolute Minimum Viable Product and throw it against the wall to see if it’ll stick long enough for world+dog to begin eating it, you will need to start marketing the product, which - at that stage - is simply yeeting it at the appropriate community and employing Observability to see how they use the product.

There are a ton of details that do matter very much, but a lot of SAAS products can be bootstrapped through the MVC stage on a literal shoestring. Like, even on your own iron if you’re willing to host at home on a strong symmetrical SOHO (business-class) fibre Internet connection.