Patience, and not trying too often- that just stresses them out & makes them more likely to refuse.
If you were feeding weekly, start offering every 2 weeks, & if refused every 2 weeks, make it 3. Just hang in there, if temps & privacy (etc) are all good.
Are you handling this snake? Might you be over-doing it?
Any other changes inside the enclosure (or nearby in the room) that might be upsetting the snake? Things like too much activity or vibrations, a cat or dog stalking the BP's home, etc.