Weaning

I think My 4 month old daughter is starting to wean herself off breastfeeding, and I feel really defeated that our journey may be coming to a end extremely soon. We started supplementing formula when she was a month old but she just now started to not want the boob and stopped breastfeeding during bed time and through out the day.. I feel extremely defeated

I really don’t want our journey to end so early... any tips on how to help get her back into the boob?