Use a password manager. This means you only have to remember one long and strong password. (Highly respected security wonk Bruce Schneier says it’s OK to write this password down and keep it in a safe place. A Post-It stuck to your monitor is not a safe place.)
Nerds love fighting over which password manager is the best. Just pick one that suits you and stick with it. There are free and paid for password managers available. This is worth paying for.