1) Don't quit.

It doesn't matter what you've finished with. Release it anyway.

Yes, even if it's broken.

Releasing a game is something many developers don't get enough experience in, because 9/10 of us finish 1/10 of our projects. This is one thing that makes jams so great. Get a game done, make it play, and get the experience you need in releasing and managing it. Take advantage of this time and learn.

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2) Watch your scope. Please.

It's incredibly easy to say "I'll just make a simple platformer" or "I'll just make a simple match-3 game", but those games aren't nearly as simple as you think they are. Try if you must, because it'll show you exactly what we're talking about when we say "go even simpler than that", but please, go even simpler than that. Trust me. This is my 11th year of gamedev, I like to think I know what I'm talking about.

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3) Don't be discouraged by other projects.

This one's really hard. You're going to see progress updates that look amazing, and people's work that makes yours look like first-year garbage. But here's the thing: your work is your work. Be proud of what you're making. We like to say "the real prize in a game jam is the fact that you actually did it". These people are just a bit further along than you are, and that's totally okay. Keep on it, don't get discouraged, and you'll get to that point yourself soon enough!