Your adventure level is the main upgrade system of Genshin Impact and determines how high you can level up in the world and upgrade your personal characters and weapons, as well as give you access to level-locked missions and events.
Complete daily commissions
The best way to collect Adventurer’s EXP is through the Adventurer’s Guild daily commission. These can be obtained by talking to Katheryne in Mondstadt and Liyue, and there are four different commissions per day.
Completing them will earn you 800 EXP points and 500 EXP rewards when you report to Catherine after completion. If you manage to complete the daily commission for three or four days in a row, if your level is higher, you may be able to upgrade up to two levels per week.
Defeat world bosses
The next best choice is to go to the world boss around the map, where you can collect a large number of adventurer EXP and many exclusive rewards, so that you can work on your character. You can find them in your Adventurer’s Handbook, which has both very simple options and some more difficult options, where you can turn to cooperative mode. The only disadvantage of these is that you will rely heavily on the original resin to collect rewards, including Adventurer EXP.
Unlock and finish Domains
Completing some domains scattered around Teyvat, can give you too much adventurer EXP. Once you complete them, you won’t get the same amount of rewards the next time you do it. Still they are still a good way to gather resources to upgrade your character and weapons, and to complete the achievements in the game.
Complete challenges in each chapter
There are lots of achievements and challenges, which will be completed depending on how you progress in the story, also linked to your Adventurer’s Handbook.Doing these missions is easy, since you are commonly asked to explore around the available regions in addition to improving artifacts, weapons or characters, and even unlock some points of interest, so it is an accessible but limited way to get experience and discover everything about Teyvat.