Card level in Star Wars Battlefront 2 is just one of the progression elements that are deeply tied to the Star Card system and Loot Boxes of the game. To craft Star Cards you’ll need to have a certain Card Level in the game, and there’s only one way to do this.
As you unlock more Star Cards in each class in Star Wars Battlefront your Card Level for that specific class will increase. The more and better cards that you find, the higher your Card Level will go.
Getting a higher Card Level in Battlefront 2 is important for two reasons. The first is that it allows you equip more cards on your character. The second is that it allows you to meet certain crafting requirements to craft higher tier Star Cards to ultimately make your character classes more powerful.
So the question comes back to how do you get more Star Cards? If you’re looking to increase your rank in a certain class and you have the extra crafting parts you can simply craft them in the class that you’d like to boost your card level or you can hope to earn them for the class you’re looking to upgrade by buying the appropriate Loot Crates.