Step up to 15mg?

I feel like 12.5 just literally is not working anymore like absolutely can’t tell I’ve even injected. I already inject a day early, I don’t know how much difference there would be in pretty much maxed out at this point, do I take a break, or if I need to think about how to reset my body or switch drug? Help & advice pls. Really don’t know what to do here. Weight isn’t moving either now and have been gaining for 3 weeks with no calorie increase. Help honestly 😭 EDIT; I don’t know if 15 is a maintenance dose only can anyone advise if they had this and it started working again?