(PLEASE READ!!!)Amazing game just wish there was a way to get Dragon stones faster

I mean I know you can get dragon stones by ether buying them or missions/events but I finished all my mission and all the events I dont really need and its kind of bumming me down that theres no faster way to get dragon stones. Maybe its possible for a new update that gives an even once a month to get a dragon stones like hundreds and hundreds of stages u beat a boos on hard, z-hard, or super on stage one you get 1 dragon stone, stage two 2 dragon stones and so on and so on. Come on people like this please, everyone doesnt wanna spend money for dragon stones for this amazing game please if you read reviews please read this to get more DRAGON STONES!!!

Alas_Family5 about DRAGON BALL Z DOKKAN BATTLE, v3.1.1