1. Use a good¹ password manager for everything.
2. Upgrade at least critical logins to use 2FA, which becomes much easier when using a password manager.
3. Use password manager features that allow you to detect weak and compromised passwords, and fix those.
¹ I'm recommending 1Password to less-technical friends/relatives, and 1Password or Bitwarden to tech-savvier folks.
Primarily out of personal unfamiliarity with Bitwarden, although I feel safe recommending it to certain users because of its reputation with HN users. Because 1Password is my (and my family's) daily driver, it's easier for me when people who are new to password managers invariably come back to me for help.
Other considerations: My impression from reading "vs" reviews is that 1Password edges out Bitwarden in terms of user experience and features. Also, I do (possibly unfairly) assume that Bitwarden is focused more on corporate IT and technical users based on the availability of self-hosting, etc.