And how in the world do you guys get crystals that fast, it takes me forever. Any tips?

Okay i may have not been clear i am wo1 and i mainly use thunder,isida, and smoky, (and the occasional firebird) now im not sure if itll be worthwhile to get isida or smoky m1, or maybe save for thunder. I have firebird m1 already, i need tips i dont wanna buy something i will regret

Hi im currently warrant officer 1, and have nothing upgraded except firebird m1, i currently have 11000 crystals, should i buy smoky m1, or should i save up for something else, and if so what.