I would focus more on the complexity of each project in your portfolio rather than the quantity. If you have been maintaining a single app for a while, especially one used by others, it looks better than a dozen weekend projects IMO. Ideally projects should be related to the position you are applying for, but having a variety of things can demonstrate an ability to adapt.

As far as interviewing, since you are self taught I would make sure your CS fundamentals are solid as a lot of companies are using leetcode/hackerrank problems as a filter. Dynamic programming, data structures, time/space complexity, algorithms. If you grind enough problems you should have a good understanding of these things but it's important to be able to explain them too, at least in an interview.

You can join any number of CS dev communities and you'll hear the same thing. Getting your first job at least is a massive grind, just keep applying non-stop, don't get discouraged. And DONT burn yourself out in a single day by applying for 100 jobs thinking it will help. Best of luck to you.