When merging, if you class up, you lose every merge that unit has. So if you have a 4*+10 merged, classing up makes them a vanilla 5*, 0 merges. You have to level them all up into the class you want for merging, and then feed them to each other to creat a merged unit (so if you want a 5* merged unit, you’re going to need 220,000 feathers just to go from 4-5, and if you had 3* previously, tack on another 2,000 for a grand total of 242,000 feathers). So I’d recommend either making a 4* +10 (do not unlock potential beyond that) or start saving feathers.
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