Anyone have any tips on how to get better coupons as an employee

I used to get decent coupons like 3$ 4$ some even 30 or 40% when I first started,now I get bad coupons like 4 off 70 or 10 off 30 and if I’m lucky 10 or 15 percent off is there a way I can better coupons now I do buy stuff there like a drink or whatever every shift could that be it also or am I just un lucky any tips will be helpful