I know for Chrome (desktop), all your stored passwords can be viewed at:
⋮ > Autofill > Passwords.
Safari: https://support.apple.com/en-us/HT211145
Andorid: https://support.google.com/chrome/answer/95606?co=GENIE.Platform%3DAndroid&hl=en
iOS: https://www.businessinsider.com/how-to-find-passwords-on-iphone
I use the same password for all Reddit accounts. It's the only thing I can do that I will remember.