How to feed my baby?

Recently my baby started refusing formula, whether on its own or mixed with my own milk. I’ve never had this issue before. There have been times where I’ve had to supplement every bottle for a week and I haven’t had an issue. So to say the least I’ve cried a lot these last few days over all the wasted milk. Point of this is, since he will only drink breast milk, and we just upped his bottles, I don’t make enough to keep up with what he needs daily. And if I keep having to take from my frozen, that isn’t going to last very long at all, a week at most. I dont know what to do. How am I going to feed him if he refuses formula now? He’s 4.5 months so he’s still a little too small to try to start solids. Picture of my chunky baby 😭