Level 30 to level 50 is quite a lot, cause lvl 30 to lvl 50 is about 1 million xp.
While technically possible, not a lot of players manage to get the 2M/month xp you need to pull this off.
Have you tried selling them the maps pack https://www.warzone.com/MegaMapsPack
Otherwise i guess everyone will be playing a lot of round robin lotto tournaments? Or how do you imagine this working?