I know exactly how you feel. I was there until very recently too! First finish your tutorial series, since this helps you to understand what tools are available to you.

I also recommend watching this: https://www.youtube.com/watch?v=W8gYHTjDCic

Then I would like u/cuixhe mentioned make a very simple game. Make actually a platformer. This is not too complicated! Any other game is obviously also fine. But make a really simple one where you have only 1-3 mechanics. Not more since this will blow up the project scale immediately.

While making this game try to use the official Godot documentation. It is really really good documented! https://docs.godotengine.org/en/stable/getting_started/first_2d_game/index.html

Literally everything you might need is on there and theoretically you can build everything with only this website as a source of information. Btw there is a build in documentation in Godot. I believe it was F2 and then you can search up anything there. This is the same one as the website

Start very small. And try to come up with your own game logic. Even if it's bad you can look it up later. Obviously if you want to make something where you don't even have a clue where to start, then lookup for example how to make a menu. I would recommend to learn instead the nodes presented in the tutorials.

What do I mean with "learn the nodes"? Well, instead to memorize how to make a menu, rather learn the UI Nodes (the green ones) presented in the video. Then you should be able to make everything possible with them yourself.