Genshin Impact has a large variety of characters to unlock and add to your party.
The problem is, you can't just unlock them through progression, instead, the game has a sort of gambling aspect to unlocking them.
What Are Wishes
These are in the form of Intertwined Fates and Acquaint Fates.
Each can be purchased for 160 Primogems, and 10 Wishes guarantees at 4 or 5-star character.
Depending on the Event Wish that you're going for, different Fates will be used, so it is best to keep hold of your Primogems until you're ready to Wish, otherwise, you might not have enough to grab the character you want.
You can also use Stardust and Starglitter to purchase Fates, although you generally have less of these as you unlock small amounts over time, usually by Wishing.
How To Unlock More Wishes
The best way to unlock more Wishes is to get more Primogems, and there are a variety of methods to do so.
Players can purchase Genesis Crystals with real money, which can then be used to purchase Primogems.
But this can end up getting expensive but is your easiest option if there's a certain character you must have.
MiHoYo regularly releases new promo codes which grant players Primogems, Mora, and a whole host of other goodies.
READ MORE: Genshin Impact Promo Codes
These are usually available for a few weeks so be sure to keep scouting them out so you don't miss out on any freebies.
Increase Your Adventure Level
By levelling up you quite often unlock extra Primogems by talking to the receptionist at the Adventurers Guild near the entrance of Monstadt.
Find Primogems While Playing
Primogems can be found all over the game, by completing quests, in chests, completing achievements, and discovering Statues of the Seven, Domains, and Teleport Waypoints.
Basically, just play the game and always be looking to complete objectives and you will unlock many Primogems through natural playtime.