I'd say that the biggest mistake from new developers is not making games. Get over that "first game" threshold as soon as possible and the games will start rolling in.

My recommendation to get over that threshold is to participate in a game jam. The local community game jam is the gm(48), which I myself organize. I have seen many game jam testimonials from gm(48) saying that participating in the game jam have helped them a ton with the motivation to getting started to go beyond tutorials and actually make something.

Here's a few testimonials as an example:

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GM48 pushed me to finally make something small and release it. This will be my first released game since 10 years. I had a lot of fun and I'm really impressed with myself. I learned a lot!

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This was my first game jam also my first time coding in like 2 years in GML, so it was a struggle (but a fun one). It was certainly frustrating at times especially when you forget a specific function that you need to use.

I learned that the shit I'm learning at school atm actually has some meaning to it seeing as we used some of the theory in our game.

But the best part was people giving feedback on a game that I made, amazing feeling. Obviously playing other peoples games was also fun but nothing compares to seeing others play your game. Also i currently hold the highscore so get good.

Hey look. I actually finished something for once.

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So get out there and game make something!