Perhaps the solution is to send fewer posts ...
This is difficult to achieve because there is no way to visibly notify users except by sending a comment on their posts.
4320 comments/day was the limit before HF20. Now it raised to 28800 comments/day (if you have enough RC). Anyway, even this last value seems insufficient to me if we all wish that there are several millions of daily active users.
The Steem blockchain lacks a notification (communication) mechanism (transaction) that can be used in a similar way by all clients (steemit.com, busy.org, eSteem, ...)