If your client is smart it could do "only X posts per person per day, sorted by most liked/zapped", but it would have to fetch all posts in a single go (or use other smartness to get this behavior).
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Then clients could also do adaptive sorting/shifting, where it makes sure that you don't get two posts from the same person in a row (e.g. it could adjust the sort, but with some limits, e.g. do at most 1hr timeline shift)
Then there could be another option where the app+relays finds precisely the folks that post at most once per day and the app could have another tab "rare posters" or something like that :)
Yeah, interesting problem. Have the same issue in my music apps. Have a massive library and lose musicians for years, forget their names completely and cannot ever find them again without spending a load of time.