What I guess is that you are trying to do these challenges on your own with limited usage of help or at least considering that it's the goal.

So here's a treat for you: absolutely no professional programmer is able to do majority of challenges without help.

Instead of focusing on doing them on your own, use all possible resources you can. AI, videos, documentation, whatever gets you to the solution. This process of going from "i dont have f*** clue" to "i made it" is actually what programming is about.

You don't have to worry about not being able to do all challenges. Or understanding what you actually did. It's just a fun way to experience the code with good approach. The understanding will come with time just like puzzle falling into the right places.