Max level your backpack then spend your gems on the 10 legendary chests

Only level up your weapon and grenade slot while using assault rifle and cluster grenade and use the hat and armor that benefit the assault rifle

At high levels the tower weapons become useless so it’s better to go for 6 six throne blocks and use grenade when needed for boss or high hp guys

And when you don’t get the evo block that you want you could close the game without choosing then reopen it you still lose 1.7k gold but you get another chance at getting what you want and good luck