Disconnect any SSO (aka “Log in with Google", "Log in with Facebook", etc). These connections allow Google to track your identity and activity across many services.
Compartmentalize. Avoid setting up new accounts when possible. Use burner email (email address you don't really use that is a pseudonym) or a temporary email.
Obfuscate when real info is not necessary. Use a burner email for signups when possible - a junk email address you never really need to check
Avoid posting sensitive info (e.g. birth date, location, life milestones)
Use pseudonyms where possible - Most services don't need your real name
Delete old accounts that you don't use
Not sure what accounts those are? Use a password manager so that you have a record of what accounts you have!