I hope I am in the right place to leave you this comment for a possible modification to test.
I'm currently on one of the birthday servers (europe) and get a lot of secret adventures but we can't use them because only one is possible per day.
But since the server is x3, why not allow 3 secret adventures per day, or 1 every 8.
On a test x5, 5 per day, or 1 every 5 hours.
Thanks to the game's authors for this pleasant entertainment.