Refactoring code that I've wrote like a year ago, made me realise how much I've grown in the past year, do you guys ever go back to old code that you've wrote?

Yep. I think we've all been there. Great feeling that makes you think how will you grow in the coming years.

Only when I feel bulimic or nostalgic.

I prefer to delete old repos of mine. I will only keep the compiled binaries.

The crap I coded years ago isn’t worth keeping it nor looking at it again. A refactoring approach would have a complete rewrite as a result anyways.