I can tell you about the simplest way. These are online exchangers. To select the most favorable rate and conditions, I use BestChange. This is a free Internet-service intended to help finding electronic currency exchange services with the best exchange rates. Here https://www.bestchange.com/dogecoin-to-visa-mastercard-usd.html I very quickly found favorable conditions for my dogecoin to usd exchange.
The advantage of this service is that the system itself searches through online exchangers. And this is more than 440 exchangers. And there are user reviews.
Investing in forex carries a high risk that an investor must consider. Exchange rates fluctuate from hundredths of a percent to tens of percent over the course of several months. So, feel free to read the following swissquote reviews