Should rank up 4 star champions?

I have completed act 5.
So should i rank my good 4 star champions.
Or just focus on building a 5 star roster?
So should i rank my good 4 star champions.
Or just focus on building a 5 star roster?
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Comments
Using t1a on 4* is a waste and trust me, you will regret it.
I really lack t1 alpha.
Thank you all