I think 5* armor units will help you break in, but staying in T20 requires some heavy merged 5* units. For really high tier 4* units, like Cordelia, Fae, Nowi, etc, I'd say you're better off just merging them into a 5* +10 unit instead of using them for a 4* unit. 4* supermerges will also probably help you break into T20, but staying there requires some investment.
IS has been pretty generous with Feathers, so it may not take as long as you think.
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