First option is to find a 3rd party dealer that’ll buy it out. Try carmax, etc
Some of those dealers won’t buy at the end of the lease or have reported issues buying out from TFS. If you want to sell to one of them, you can buy out the lease and then resell. In CA, there is a process for being exempt from sales tax on the buy out if you resell within 10 days. Third Party Lease Buyout
Whatever you do, don’t just turn it back in.