Problem with using zaps is that they are unverifiable, except for the sender and receiver. Reactions, reposts, comments from with WoT could be another way. I do like the idea of catching up after some time away. It's too bad zaps are unverified, otherwise it could be useful for outside a WoT system and useful for discovery. An invite system into Nostr may help bootstrap a WoT for those that are new, the invite could include a suggested follow list and notes to view and possibly interact.