Hiw to upgrade 5* champ

Hiw to upgrade 5* champ when I have 5 tier 1 one alphas but it only let's have 4 the rest sit in stash can anyone advise please.

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Can anyone help me

What level are you?

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None of us had the chance to be in that situation before... Kind of funny actually.

Story mode and Exp boosts to level up as quick as possible.