I think you just have to start: have an idea for something slightly different than any of your kits do, assemble it on a breadboard, go through the pain of troubleshooting it (and maybe working-around issues you can't quite solve directly). After that, blog posts and youtube videos about other people's little projects will be of more value, you'll be able to really think about the circuit they designed in a different way, it'll have some concrete ideas in your brain to make connections to.

(This is how I think about software too fwiw. Start trying to write something on your own, then study the technical detail after, the technical detail will have something to relate to instead of just floating abstractly away. Then try to apply it yourself again, you'll probably be excited to use it at that point.)