On this page of the guide to Genshin Impact you will find out where to find a Chest that guarantees as much as 200,000 Mora.
To reach the crate, which guarantees 200,000 Mora, head to Liyue, in the Liyue Harbor region. Then, head to the city. The city is a home to an NPC named Xingxi, who is marked on the map with a diamond icon. He is a Souvenir Shop vendor that offers items in exchange for Geo Sigils. To have a better idea of your surroundings, Northland Bank is located above this vendor. Walk up the stairs to the top, sticking to your right. That's where you'll find an NPC named Nadia. Enter the building next to her. Once you're inside, there's another staircase on the right. Go upstairs and forward. Down the hall, you'll find a Precious Chest, containing 200,000 Mora.