Think of something that has been present in your life for a long time. It can be something concrete, such as an article of clothing or furniture. Or something more complex, such as the town you live in or a relationship you have.
Whatever you choose, describe what it is and the role it plays in your life today.
Then flash backwards to other contexts where this same “thing” was present. Describe what was going on then.
Your writing will show one small ribbon of continuity running through your always-changing life.