In Madden 21, Although players can get coins in different ways, it may take a lot of time for the player. So the fastest and most effective is to use real money to buy them. You can buy cheap MUT 21 coins through a third-party. But how to choose a third-party to buy mut 21 coins, Here I choose U4GM.COM.
https://www.u4gm.com/madden-nfl-21-coins