The most optimal option for this are exchanges, since it is easier to quickly buy or sell cryptocurrency on them. There is also a leveraged margin trading option. It is suitable for professional traders as it has much higher risks.
To exchange cryptocurrencies, I use online exchangers. There are a lot of them. But BestChange helps me make a choice. BestChange has over 440 exchangers and it is a convenient search engine. In just a couple of clicks, you can find the best exchange rate for dogecoin to usd https://www.bestchange.com/dogecoin-to-visa-mastercard-usd.html or any other cryptocurrency.
Now the cryptocurrency market is developing rapidly, and at the beginning I was engaged in the purchase and sale of cryptocurrencies. Now I'm trying to invest in the new defi lending system. It is available 24/7 to any Internet user. You don't need to visit a bank, stand in line or fill out paper forms to manage your finances. Binance is the best choice to buy DeFi tokens. Binance is the largest cryptocurrency exchange with over 300 types of cryptocurrencies and tokens, including DeFi. To better understand the DeFi system, read the information here.