Freeze credit on the big 3 websites. I unfreeze when needed like when I financed my car, then lock them up again.
It is a pain, and be sure not to lose the passwords. Turn on MFA where ever possible. Do not use correct answers for secret questions, use made up answers and keep track with a pw manager.
Check your credit every year for mistakes or oddities.
If you live in California, contact data brokers like Lexus Nexus or Red Violet and have them delete your profile.