This guide will tell you how to unlock More Character Cards in Genshin Impact. Go through the guide and follow the simple steps to unlock it.
The first thing you will need to do is level through the tutorial, then to the board on the wall and hit square to open up the Player List.
If you have a challenge invitation, then you can invite a player from the friend list and fight with them. You have to beat them and you will get their card as a reward. Some will of the characters in this list are unlocked and you have to level up to unlock them. You can also buy some as you level up. Beat the characters to get yourself harder challenges and then you will be able to unlock even more.