If someone can't handle a password manager then writing down a longer more complex password and locking it in drawer is still better than picking a simpler password.
Other than that, although the process can become tedious when applied manually to a multitude of passwords, diceware helps with generating easy-to-remember passwords:
https://blog.1password.com/toward-better-master-passwords/
You probably still want to keep a secure record of those somewhere, which is where password managers come in handy again.
Easy is for junk I don't really care about. Moderate is for stuff I do care about but doesn't contain any personal info. Difficult is for things that involve personal info.
Here is the fun part --- I have a 4th category called "critical" for extra security. In these cases, I combine the difficult base with one of the other two and then add a special context character at the end to indicate type. For example, with banking/money related stuff, I'll add [$]. Also, the easy password can be spelled either forwards or backwards.
All together, I have about 40 different passwords that I use but I really only remember the 3 bases. Even when I am not sure, I can usually guess the correct one within 3 tries based on context --- the objective being to avoid getting locked out.
For example, if it is a banking website, I know from the context that it ends with "$" and it contains the "difficult" base.
Obviously not perfect but where security is concerned, nothing ever is.
For example : Alice Amendment%Liability%Indicates%Cute%Energy2006
- ILikeDarkChocolateGmail
- ILikeDarkChocolateApple
- ILikeDarkChocolateWhatever
and so on.
How good does it look?