Some people get better with time, like a playlist you keep adding to. Don’t lock in your opinion early.

An early read on someone is a snapshot of a person who is still changing, and filing it as final means you keep interacting with the snapshot rather than the person. People acquire things: experiences, softening, competence, a sense of humour that was not there at twenty. Your opinion, once fixed, stops updating.

Pick someone you decided about a long time ago and give them a fresh look with no reference to the old file. Ask them something you would ask a new person. Reasonably often you will find they have been somewhere since you last checked.