And don't attack destroyers, since they can kill you with one shot. Other tanks are easier to attack, since you can absorb one or two shots.
Diep.io NEW strategy!

Although this is a good strategy it has been around for a while. And as Boyangzhao said people normally do Booster for this since it's so much more effective.
I invented the sneakiest strategy in diep.io!! Here it is: (works best in 4 team)
Tips:
Good luck following this strategy, unless you are attacking me!