When reflecting on past experiences, we often use the phrase "looking back on." However, there are many synonyms for this phrase that can add variety and nuance to our writing. Some alternatives include reviewing, reminiscing about, reflecting on, pondering, considering, mulling over, evaluating, and appraising. Each of these phrases carries a slightly different connotation and can help us tailor our writing to the tone we want to convey. For example, "reviewing" implies a more systematic and objective approach, while "reminiscing about" suggests a more emotional and nostalgic tone. Experimenting with different synonyms can help us infuse our writing with more depth and complexity.