Cordial is a real relationship level. Not everyone has to be close for things to be fine.

People push you to sort everyone into friend or problem, as though being merely polite with somebody means a fight is coming or a friendship is failing. Most people are neither. The coworker, the second cousin, the person in your class, plenty of these work best at a friendly distance where you are decent to each other and then go home.

Stop repairing relationships that are already fine at the level they sit. Say hello, be kind, keep it short and genuine. Arm’s length is a working arrangement, not a failed friendship, and not everyone who is far away is drifting.