You can use online exchangers. It's very simple and fast. There are many online exchangers. And so as not to waste your time, use BestChange. For example, here
https://www.bestchange.com/dogecoin-to-visa-mastercard-usd.html you will find in a moment offers to exchange dogecoin to usd
BestChange not only cryptocurrency, including altcoins and stablecoins, but also all e-payment systems popular in the world, as well as fiat (cash, bank wire, Visa / MasterCard).