If you're sitting on 50 mil shares, I would sincerely believe you're not an amateur. Obvious answer, sell blocks into the ask. Kill the run, minimize your profits.
You can be sure that if you ever were to execute a market sell shares order on a position anywhere near that size on a thin OTC stock, then you will get terrible fills, they’ll drop you 50% before you can blink. Then when you’re out they’ll rip it North. Welcome to the jungle.