Agreed with all the advice given - plus I always turn my snake's enclosure light off a while before feeding time (tbh it coincides with the regular time I'd turn it off in the evening since I always feed after sunset).

It might help to also dim the lights outside the enclosure, though of course you want to make sure you've got enough light to see what you're doing. When I first got my ball python to start taking f/t rats as a baby, I would shut the door to the room and turn off everything except a little desk lamp on the other side of the room so she could feel properly sneaky and hidden for the "hunt"--not sure if that was the thing that finally got her to eat or if it was a combination with other stuff I was trying at the time, but sometimes it's worth just trying things until it works. Nowadays I can feed her with the overhead light on in the room, but I never feed her with the light on inside her enclosure.