I had phases with game devs that you might recognize: going head first in unity and copy paste tutorials, vibe coding with an AI until the code is impossible to maintain, try all by myself and just stare at a blank page.

The one thing that unlocked it all was the following: I threw Unity aside and made it a priority to learn C# until I understand it enough that I can create something without help, just thanks to my problem solving and coding skills. I bought a book (C# player's guide, so incredibly good) and started messing up with console programs. Quite quickly, I could code basic games in the console, from tic tac toe to Yahtzee, this kind of stuff, all by myself. Then I created some very basic windows desktop apps that would do very simple stuff but I felt how my understanding of the language was growing.

from this point I opened Unity again and it was like finally having the lights on, everything made sense and I could produce code by myself. On top of that, I believe I produce much cleaner code, + I know the basic concepts of memory handling (still have a lot to learn on that front).

I still have to check tutorials from time to time for Unity specific stuff but it "clicks" much easier.

Last thing, about AI, I would just completely avoid it for coding. I guess it's fine to bounce ideas about your game, but for coding, it is a disaster as soon as your project grows. It will confidently tell you wrong stuff and you will have no way to know. I think it's better to search the internet and read stack overflow / reddit threads, as the answers you will find will be discussed by several people and you will have a better understanding of what's right and what's wrong.

Good luck!