Exclusively formula fed

So baby boy is almost 4 months. Ive been pumping daily ( no matter how many times) I average about 15oz only.

Ive tried everything to boost this number for the last 3 &1/2 months. Im to the point where i cant take it anymore.

So the question i have is, is it too early to quit breast milk & switch only to formula?. We feed him 5oz 6x times a day. So hes only getting 3 bottles of breast milk. Seems like i need to do multiple days of pumping just to get one day (3 bottles) of breast milk to drop him off with.

I know some of you guys will say breast milk is the best, but honestly i dont think my body produces enough.

And please i know i asked a question but if we can keep it classy & not nasty it would be appreciated.

& heres a pic of my handsomeness just cuz i love this little human!