Remember that if you trade it in it will reduce the taxes on the new tractor. I’d check a dealer for the trade in value, maybe decide what you want to upgrade to first, and then decide what you want to sell it for privately…
My Kubota dealer helped me price my first Kubota when I was ready to sell it. I was in the process of buying a second Kubota from him. He also offered to sell it on consignment for a $500 fee. They generally don’t deal in used equipment. Trade-ins are quickly sold off to wholesalers or auctions.