You must first check where your tokens are listed. Then, if you have them on several exchanges, you can compare prices between them and choose the most profitable place. Overall, the answers depend on the tokens you have and the stock markets they offer.
Yes, the very first thing you have to do is check where your tokens are traded, maybe they are not yet on the exchanges. Look at your etherwallet, if there is an amount in dollars, then boldly look for exchanges through coinmarketcap or somebody gave another option in this topic, then check where the rate is better and sell on this exchange.
But now the market is red, I would advise you to wait for growth to get more profit.