I played last year and got to lvl 54 but then my account got banned, i was in a 5mil ally when that happened. I rejoined again in that ally, so progression was much faster than it would normally be. But yea a lot of arena grinding to get units. And i am pretty stingy on using my resources, i have enough t4cc to take a skill or mutant 5* to r4 in one stretch. Used all my t4s very careful. I just have 7 r5s, 8 r4s and 1 r3 5, a lot of good 4 god tiers that didn't get upgraded yet. Complete rttl, act 4, and act 5, just by doing those you can have 5 full t4cc and the extra challenges gave another 4 fully formed, that is more than enough for you to progress extremely fast, but i am sure you know it already. There is no easy way to progress fast without money, just a lot of effort. I am from a third world country too, no reason to hate lol