How Do I Progress More?

One way would just to start working on a game, or at least, that's how I learned. Because whenever you start a game, doesn't matter how prepared you are... things will start to mismatch left and right. So I think before learning new stuff you have to put down the things you know. For example you could start a small FPS indie title... but maybe let's say your gun system fails and you go to the dev forum or this website to get help. You learn that the method you used is old, outdated and really unefficient and there people teach you how to make a new and improved one. So now with your new knowledge you go and fix the gun system, and about 4 other errors pop up, you do the same exact thing and so on.

I see learning scripting really as trying, failing, learning and repeating. No game was just put down in 2 days with no errors whatsoever.

Or maybe trying to jump head first into an indie title sounds too hard, you could try to do tech demos: Basically where you write some code, see if it works, try to solve, if that doesn't work do same stuff as you would in an indie title.

I'm not the best scripter out there, but certainly not the worst and all I've learned was from reverse engineering free models and asking for help online, hope this helps!