Well, focus is all about picking 1-2 projects to work on, and excluding anything not-relevant to those projects. You can't make 10 projects work at once. So pick 1-2 and commit.
Which of your projects are most meaningful to you? Which solve problems you care about and seem most interesting? Start shipping something, share it on HN, Twitter, IndieHackers, etc. Getting positive feedback can also help you stick to 1 thing.
Note: don't focus on technologies and ideas so much, focus on problems to solve for others. What can you make easier for others that would be valuable for them?
A bit more on the point about excluding things and the whole topic of focus here:
https://www.deprocrastination.co/blog/how-to-focus-in-the-ag...