It depends on which token you are holding. You can check the market tab of that token on Coinmarketcap to find the exchanges where you can trade those tokens. On the other hand, there are some portals like Coinswitch where you can exchange your tokens without opening the account on any other exchange. If you are directly selling on the exchange then make sure that the exchange has good volume to process your order faster.
Thanks...I just register on Coinswtich