Like others have said, make sure your husbandry is good(temps, humidity, security) and then just wait it out offering food every week or 2. Don't offer too often as this can scare the snake and put him off of food for even longer. My girl hasn't eaten since Oct or Nov and I don't even weigh her. I just eyeball her to make sure she still looks good. She did give me a surprise poop about 1.5 months ago which amazed me considering she did eat anything for a few months before that so that should give you an idea of how conservative these little guys are about food and energy lol. I offer her a rat every 2-3 weeks when its my boas feeding time so if she doesn't want it, my garbage disposal boas will eat it haha.