Sorry. 
I think this is the wrong inquiry. 

Sovereign Nostr users have demonstrated that they value “personalized” more than “client curated” follow recommendations. 

A better inquiry (imho) : 
“Please suggest high signal (and open source) WoT algos for recommending new follows based on a users current activity and followed friends.” 

Top two or three algos (we are building nip51 list generators) can be added as another row of buttons to your “explore” tab under “from your web of trust”

If your concern is “the new user” who “has no friends on Nostr yet”, then even this can be handled without resorting to   “client curated” recommendation lists.

The “trending users” and “recommended follows” static lists on Primal are the source of endless humor on Nostr.

Srsly. We are scrappy, but we can help. 
nostr:npub1u5njm6g5h5cpw4wy8xugu62e5s7f6fnysv0sj0z3a8rengt2zqhsxrldq3