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!