The word "go/come back" can be replaced with many synonyms to add variety and interest to writing. Some alternatives include "return," "retrace," "double back," "circle back," "regress," "revert," "retreat," "recall," "retrieve," "revisit," "resume," and "rejoin." Using a different synonym each time the phrase appears can help create a more vivid image in the reader's mind, and avoid redundancy or monotony. Whether a character is physically going back to a previous location or returning to an old habit or relationship, there are plenty of options to choose from to express the idea.