Breastfeeding

Hey guys so my now 1 month old used to latch great to me. but we were supplementing with formula because my supply wasn’t enough. So he now hates latching to me and starts arching his back and struggling to latch. Is there any way I can get my supply back up and have him breastfeed? Any tips if this happened to you would be great. Mentally this has drained me knowing I can’t breastfeed but I want to try my hardest.