And if I can't remember my password?

Use a password manager like Bitwarden or the password app for nextcloud.

Just like on that other website starting by r where nobody let an e-mail address at subscription you're screwed. On the other hand, on that famous website people had like 3-4 alt account and where deleting their account all the time., so not that of a big deal

But indeed, with the ongoing password hell So choose a password, with 10 character, one number, one capital, and soon one emoji it's getting very easy to forget if you don't use a password manager.