Presenting Yoink, a Nostr contacts manager that let you compare your list with others, discover new people to follow, and grab their best contacts with just a few clicks!
Yoink
So if you select a person on the list you would see who you both follow, and who else they follow that might lead to an increase connection coefficient.
Lots of ways to do the visualization, either static or dynamic. Network topology is a new science, but Obsidian has some of the best data graphs that I've seen.