Trading in '21 Hyundai Sonata SE before the lease is up?

First get the actual payoff from HMF

Second, go through the list of third parties who will buy your lease, plug-in the VIN as if you own it, see how much anyone will actually pay for it. This will help you to establish a trade-in value.

The challenge with HMF is they are impossibly slow to process a lease buy-out. Very few third parties want to buy out their leases. You may need to buy it yourself first (and pay any sales tax) for someone to buy it.