Upgrade your Caravan to get to the higher level mountains
There are 21 Caravan levels in total. You need to spend 0.1-0.5BNB in GRUSH tokens in order to upgrade each level.
In order to get access to bigger mountains with larger rewards, you will need to upgrade your caravan to fit more miners and gunmen. In addition, your caravan will be fitted with more durability and protection against the various hazards of the desert.