If your supplier’s MOQ is too high for your brand, you can try to negotiate a compromise with said supplier. You may convince them to let you ‘mix and match’, ordering several different products to hit an MOQ (rather than only identical units), or to sell you leftover products from canceled orders rather than producing new ones from scratch.
If you and your supplier cannot come to an agreement, consider whether it is more advantageous to deal with the surplus inventory, or to find a different supplier.