Hometown friends knew you before you got interesting. Keep at least one.

The town you grew up in holds a version of you that no later friend will ever meet. People there remember the haircut, the embarrassing year, the thing you were obsessed with at eleven, and none of that is available to anybody you meet at eighteen. That history is irritating in small doses and genuinely useful over a lifetime, because it is the only evidence of continuity you have.

Pick one and keep the line open deliberately. A call when you are home, a message on their birthday, a plan next summer. One is enough, and it is much easier to maintain one than to rebuild five after ten years.