These aren't wholly original ideas but they're things I come back to when I'm out of ideas:
Plugins for your text editor of choice. All the mainstream editors I can think of have a means of extension and it's usually pretty straightforward. Good way to flex your JS / TS muscles too when writing plugins for Atom or VS Code.
Make a Lisp. I'm a programming language nerd so maybe I'm biased, and I know Lisp isn't the newest or sexiest language, but implementing a Lisp interpreter is easier than you think. Weirdly I feel like I learned a lot about how JavaScript is interpreted by doing this. Plus you get to say you implemented a programming language!
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These aren't wholly original ideas but they're things I come back to when I'm out of ideas: