Once you level up, co-op will automatically unlock for you and can be found in the main menu. So whatever you feel like doing at any given moment will also push you toward rank 16. Story quests, sidequests, and even just running around the open world, cracking open chests, solving puzzles, and fighting bosses will all help. The good news is that everything you do contributes toward your Adventure Rank. That took me about 12 hours to reach, but I'm sure you could do it much faster. Genshin Impact map : All Anemoculus locations Genshin Impact Lisa : Which gifts to give Genshin Impact Resin : How to get and spend it Genshin Impact tier list : Each character ranked Genshin Impact microtransactions : How bad are they?