Hacker News Reader

I realize this might have some merit as a life tip, but it also sounds hilariously lonely

It can also work digitally with a text file, which may feel less lonely.

Or use org-mode?

slack's search may also come in very useful if you want to pull up an older solution or re-read your notes

If you send yourself more than 10k messages, you'll have to pay for slack if you want to search. Grep is free.