Good luck remembering them all, also change them all every 30 days, so here are my secrets.
Password expiry hasn’t been considered best practice for a long time (must be at least a decade now?) largely because of the other points you mentioned; it leads to weak easily memorable passwords written somewhere easily accessible. Even when it was considered good 30 days would have been an unusually short time.
Current advice is to change passwords whenever there’s a chance it’s been compromised, not on a schedule.
Your security is only as good as the weakest link, which is usually people. If your password policy encourages users to stick a note to their screen then your weakest link is anyone in the office deciding to take a selfie or joining a call with their camera on. Best practices balance security with what users are actually willing to do.