You’ll have to send a new friend request (and they’ll have to accept it).
Short answer:
Yes, you can unblock them—here’s how 👇 if i block someone on facebook can i unblock them
Here’s what you need to know before you do: 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
Blocking isn’t permanent. You can unblock someone anytime, and Facebook won’t notify them when you do.