Charisma gets you invited. Character is why they still text you after the event.

Being good company opens doors quickly, and it wears off just as quickly if there is nothing behind it. What keeps people around is the quieter set of traits: whether you follow through, whether you are the same person when the room is small, whether being near you costs them anything. Charm is an introduction. Reliability is the relationship.

Look at who has stayed in touch with you over the last year and ask what earned that. Then pick the friendship that has gone quiet because you never replied, and reply now.