Baby refusing breast

Baby is 5 months old and due to supply issues, has been getting a combo of formula and breastmilk since 1 month old. About 1 month ago he stopped nursing during the day - if offered, he would refuse - but he was still nursing at night. I chalked it up to baby being warm, not being as relaxed during the day, really, it didn’t bother me too bad since I work and am not typically home to nurse during the day. We are now on day 7 of refusing to nurse period. Not at day, not at night... he will arch away, cry if I direct him to the breast and it just doesn’t feel worth the battle anymore. I hate seeing him refuse to nurse as it feels like the ultimate rejection. I decided to begin to cut way back on pumping to just dry up. My motivation to continue pumping went out the window now that I’m getting no bonding time.

I don’t know if I’m searching for a solution but I’m just looking for some words of wisdom or shared experiences... it is just hard to feel this way and “let go”. I always thought I would be the one to make the call on my last nursing. I feel like I didn’t even know our last time nursing was the last time at all, so I didn’t go out of my way to enjoy it one last time.

Edited to add: I haven’t used nipple shields... but I will do some research. At this point, the nursing positions seem to stress him out. I’ve tried different positions and once he feels like I’m going to have him latch he gets upset.

I have tried to breastfeed him when he is sleeping but he doesn’t even try to latch. Once awake enough where he could latch, he does the same pattern of getting upset.