Decide what belongs together.
Your work profile, dating profile, and public social account serve different purposes. Reusing the same username and portrait makes them easier to connect. You may want that connection for your work; you may not want it for everything else. Make the decision deliberately. Use different public identifiers where separation would help.
Look at what is behind you.
A photo can reveal more than its subject. Check for building numbers, workplace badges, a school logo, a parcel label, or a recognizable view from home. Cropping a photo before sharing is often more useful than adding another privacy app afterward. Sharing travel after you return can also reduce the amount of live location information you publish.
Give each audience the right access.
Review who can view old posts, tag you, find you by phone number, or see your followers. These settings vary between platforms and change over time. Check the actual audience of a post instead of assuming the default is still the one you chose last year. Ask friends before identifying them in a public post, too.
Make one small routine.
Every few months, look yourself up while signed out. Review your public profiles and the first page of results for your usual names. Close accounts you no longer use after checking what you need to retain. The aim is not a perfectly empty search result. It is fewer accidental connections between details you meant to keep apart.