You’ll have to send a new friend request (and they’ll have to accept it).
Blocking isn’t permanent. You can unblock someone anytime, and Facebook won’t notify them when you do. if i block someone on facebook can i unblock them
Facebook does not send an alert when you unblock someone. You’ll have to send a new friend request
Any posts, comments, reactions, or tags from that person will not reappear on your timeline. if i block someone on facebook can i unblock them