Adventure Rank in Genshin Impact will increase as you earn experience from playing the game, exploring the world, and finishing adventures. Some important aspects of the game, like the gacha mechanics, and being able to play multiplayer, are actually locked away behind certain Adventure Ranks, so you will want to rank it up as quickly as possible.
There are many ways to increase your adventure rank:
- opening any kind of chest
- clearing dungeons and finishing assorted Domains
- discovering warp points
- finishing quests and story missions
- discovering new areas of the map
- beating bosses
- giving Oculi to the Statues of the Seven
- Completing Ley Line Outcrop challenges
When you first start playing the game, the best way to earn Adventure Rank is by simply being aware of your surroundings. Activate any warp stones you find, open chests that you come across, and fully explore the areas of the map that you pass through.
Daily quests, called Commission quests, are another great way to earn Adventure XP. These can be found in your quests menu on the fourth tab, but they will only unlock after you Adventure Rank 12. These will reward you with 250 Adventurer XP when you finish one of them, and an extra 400 Adventure XP if you can finish them all. They will reset at 4 AM each day.
You can also take on Boss Challenges, but you will need Original Resin to be able to get your rewards and gain the relevant XP, as such, these are more of a mid to late game way to raise your Adventure Rank.
Increasing your Adventurer Rank quickly really just boils down to playing through quests, and making sure you are exploring the game as thoroughly as possible.