There are several ways to improve your tank in tank games like diep.io. You can increase your skill points to level up. The maximum skill point allowance for a tank is 33. Different tanks can have different builds, and you can also add your own to improve your tank. There are wiki pages for each type of vehicle, and it’s possible to add more builds for different vehicles. While you’re leveling up, you’ll want to focus on improving your tank’s stats as often as possible.