2 words for you:
Password Manager
Get around to using one :P
I only remember my password to my PW manager, which additionally is encrypted with a key file to increase security.
The rest of my PWs are 128 character long random generated PWs, with capitals, numbers, special characters etc..
I won't disclose where I store mine.
But I'd recommend to:
(That would decrease security, x1 data breach would allow them to easily brute force your PW DB since they'll have the key)
I've been happily using KeeWeb + Keepass2Android for years now: