Help please I need it

Hey I'm new in the game, been able to get multiple 5* champions and one 6*, been hitting Act 4 but my champions are weak I'm stuck... Struggling with rank up resources, please help me out with any suggestion or tips on how to get rank up or how to be progressive in my journey, thank you
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basic mastery setup:parry,dex,stupefy,block proficiency,courage,cruelty,precision(not imp.for act 4),petrify,pacify,etc..
champs:heal block champs,bleed champs,poison immune,evading champs,power drain champs
for maestro:evading champs,don't dex his sp1 if you don't have the clear understanding of dexing SPs,champs that stun.....