Hey @torix, that’s a great question. If you have an average of 1500 daily connections, it seems your bridge is very useful, and rotating the IP address might not help more users. You can check your bridge’s country stats in this file: /var/lib/tor/stats/bridge-stats or on *BSD: /var/db/tor/stats/bridge-stats.
If you find that most users are coming from countries that block Tor (Russia, Iran…), I’d say that rotating the IP will frustrate a lot of users more than it will help.
Maybe you could allocate a new bridge and monitor when the IP is blocked in China, then it? Usually when the GFW detects a bridge, it blocks the IP address (and not just IP:Port). You can use this site to test your bridge’s reachability: https://www.itdog.cn/ping/.
Thanks for running bridges!