Baby refusing thawed breastmilk

So I have like 2 months worth of frozen milk that I have stored for my baby since birth (he’s 4.5 months) I’m going back to work (I commute all day for work and it would be really hard to pump in car and store :/) and since I’m exclusively pumping will be tapering off my pumping and stopping within the next month.

I’m so sad though because I realized that my baby is refusing my thawed milk, and Google says it’s probably a High lipase issue( does have slight soapy smell) so now I feel like all my hard work was for nothing 😭😭😭😭 I’m feeling a little defeated

For now I’m not even pumping enough to freeze, basically what I pump in a day he drinks, so the scalding and freezing doesn’t really apply now.

Has anyone had a similar issue, is there a way to get baby to drink it? Should I start introducing formula now since I won’t be able to use frozen stash 😭😭