To level up, all you have to do is to earn enough experience points (XP) to get to the next stage.

XP can be obtained in plenty of ways. You can:
Interact with other players and Petkins,
Take part in the cafe or bar jobs,
Purchase items,
Rate another player's Apartment,
Use the Build Machine to create items,
Complete a Challenge,
Log in daily,
Gift items to friends,
Take photos in Photo Mode… And many more.

In the end, it's quite simple: the more you interact within Avakin Life, the fastest your level will rise.

Challenge accepted? 😉