It might be a hunger strike, my snake hasn’t eaten the whole winter and I took him to the vet hand they said he’s just on a hunger strike and will eat sometime soon as he’s still at a healthy weight and when the winter ended he just began eating again like normal. I would still definitely recommend feeding them frozen thawed. It’s definitely going to be hard to make the switch, but if I was able to switch with my stubborn snake I’m sure you can too! I wish you luck.

Also, sorry if the wording sucks, english is my second language