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Hello and welcome, unfortunately this happens from time to time, occasionally, and there is nothing that can be done regarding this, other than to start another win streak.
Do the standard troubleshooting to make sure your device is as up to date as possible: Check device and game are up to date, log out and restart your device and then log back in.
Welcome to the King Community.
The event from which you get free booster every 5 levels, is the Golden Lamp event (Magic Season).
This event is not currently available in the game, so you can't find it in the game, but it could appear at any time.
Thanks!