I have been playing this game almost a year

I don't pay to play, after almost a year I've hit a slump. I win a lot have a legendary tag, I'm at level 54 but getting super hard to get the items to rank up my champions.It took me 3 weeks to rank up my 6* Herc from 2 -3. Is there anyway to speed up the process? I have not completed act 6 yet can't upgrade champs to evenly compete.
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Comments
-has hit a slump
-hasn't completed act 6
Yeah checks out
Otherwise you'll never progress at fast pace.