The current matchmaking of one full uptier is just way to much for a lot of nations and should either be reworked or tweaked.
BRs are also all over the place especially top and mid tier.
Many people are getting constant full 1.0 uptiers which makes the grind of vehicles and modules very frustrating and the occassional downtiers are not enough to compensate.
My idea would be to take a look at the BRs of each nation and vehicles and try to balance out which vehicles is capable of what since ARB sucks to play with no CM/Radar and GRB with low pen/low armor vehicles against full uptiers.
People would probably spend more money into the game if the game feels more and constantly rewarding overall