Sell "WorldMark, The Club" timeshare?

We purchased "WorldMark by Wyndham, The Club" 6000 points timeshare through loan finance, and we are still have 10000 outstanding balance. It was our big mistake. Since we are fancing financial difficulty, and we connected with WorldMark regarding stop the ownership, but they told us they don't offer buy back option, the only way we can do is to find someone to purchase our ownership. Does anyone know what is the best way to sell the timeshare owner ship? And what the value of 6000 points WorldMark worth currently?