Your particular case is very uphill - there aren't that many people or companies that do this, very limited number of openings, you have no relevant experience, not in the pipeline for internships. Learning about databases and doing a bit of C++ and Rust is worth just about nothing in terms of helping you for these jobs.

Keep it up as a hobby, find open source projects in which you can make meaningful contributions (that alone can be very hard), spend years in it, then maybe you'll have a better shot - whether all of that's worth it is for you to decide.

If I were you, I'd reconsider why you even want this in the first place.