anything that can directly or indirectly identify you

No.

Anything that is related to you as a person. This is more than the things that identify you. For example things that you have done, places where you have been … comments that you have written… You could say: all that your stalker wants to know about you.

I would’ve thought most things here wouldn’t fall under gdpr except maybe email addresses

All things here fall under the GDPR, but maybe not all things must be deleted on user’s request. That is a different question then! For example, one could argue that by posting an article or a comment, the user has agreed that it gets published here and then it cannot be taken back.