Password reuse or 'similar' password reuse is one of the most common methods people get hit.
I set a time to change my passwords and stick to the schedule. So for me as an example, I change all of my passwords between Dec.30 and Jan.2. Easy to remember, start fresh for the new year. I login to a legacy laptop running Debian that has been air gapped for the entire year, connect it to the internet, change my passwords, disconnect the machine when I am finished then wipe it and reinstall the latest Debian version. It's a ritual I've done for several years and don't plan to stop.