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Arguably selling individual sets may bring more profit (but not necessarily). But if you'd rather do it bulk, I think the above admittedly generic approach is safe to go with!
1) Gather the Mixels and sell them all at once
2) Pluck out the Technic cherries like the flagship sets to sell individually
3) Sell the rest as a bulk lot, which (used, stickers applied sometimes badly) will likely go for a disappointingly low price