All the above advice is on point.
In addition, if like to add that offering too often can often stress the snake. When you offer, wait at least a full week before offering again, but I'd wait 10-14 days.
And double and triple check temps, etc...
Is the new enclosure offering plenty of security? Are the hides nice and snug?
And lastly, no handling until you've got this sorted out.
But honestly, don't sweat it, BP s go MUCH longer than 5 weeks without food all the time. As long as there isn't drastic weight loss don't worry.