If you have or can make the time, some side projects can go a long way. Mainly to find out what you are actually interested in. I usually give myself some guard rails as to not spend too much time one one thing (perhaps say a month) and then see where that takes me.

Then, I write about the project for two reasons: I get an article out of it that I can share _and_ I get to digest the project as a whole.

Just pick anything that seems interesting and build something. Later, you can even build on top of earlier projects.