Just increase the time between your offerings to 2 or 3 weeks instead of every week. It'll help by both helping you not be frustrated, and won't encourage refusal as a regular behavior. Then when you get a few successful feeds in, you can attempt returning to a regular feed schedule.
My male did that around 800 grams. Refused for 11 months. Ended up offering one a month until he finally started taking like a boss again.
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