I want to give 50% Discount in my all services but how to do it ?

I want to give 50% Discount in my all services but how to do it ?

I want to give 50% discount on my all geeks in Seoclerks ! But is quite impossible to create coupon code manually for all geeks,
Some one please say the tricks / ways how to do that manually for all geeks via single coupon .
presently Only a few newest geeks carry 30% discount. Jordan sir or any one help me please ......
my user name: Purbitaditecha