I find your story really interesting.. I’d like to hear more about this housing lease fraud if you’re willing to share. Anyways, it sounds like you’re underestimating yourself, you’ve shipped unity games and websites already. I agree with the other comment regarding contributing to open source software.

I think the best way to learn is by doing actual projects, either personal or professional. If you need to work on a project with other people, find a remote software engineer job or open source projects to actively contribute to

Any senior software engineer should be able to judge if a practice is high quality, not just US Big Tech

The specific technology or programming language doesn't really matter if what you want is to ship product (it would matter if you were applying to specific job offers). Have a project idea, pick a framework that can solve the problem, and build the project. Most efficient way to learn a lot of technical knowledge

Example of products built by solo devs: check Product Hunt, there are products launching everyday, some built by one person