Trophies and notifications for "Best of the year"
Something like this is totally necessary if Strava wants to keep people motivated.
Especially if they are not going to filter times alone/group ride.
Some KOMs are really far for EVERYBODY if a race (professional or not) passed some segment, or some group rides.
Even your own best PRs could be so far today compared with YOUR times 3-4 years ago.
I think that some trophies or medals (also notifications if you loose the "best of the year") would be motivating for sure.