One tactic of my own is to refuse, as far as possible, to use websites that require setting up of an account, with another password to remember.
For example, I pay my utility bills via 'pay by phone', it is cumersome, but avoids yet another password. Couple of weeks ago I bought a railcard, and did so face to face at a station ticket booth, even though it would have been less bother (and cheaper) to just set up an online account - as that would have meant another password.
Where passwords cannot be avoided then actually I believe simpler and more easily remembered passwords, even with carefully considered duplication, are often (not always) more secure than long and complex ones, since the long and complex ones tend to need writing down - either on paper or in a password manager.