Double check that his temps, temp gradient, humidity, etc. is all within the recommendations of our caresheet Greg. As long as his enclosure is appropriate and he's not losing weight and is healthy (getting a fecal done is never a bad thing if you are worried) then I'd just keep offering an appropriate prey every week on his standard feeding day. Make sure he always has access to fresh water and that he's getting a 14 hour light/10 hour dark cycle and hopefully he'll figure out that spring is here and he should perk up and eat now. It seems lately that a lot of us that have had winter fasting snakes are starting to see them go back to eating, maybe not their normal amount but a start back. I was advised with our one fasting female (5.5 months...not a bit of food and only lost 100 grams) to offer her smaller than normal prey for a few feedings to get her digestion kick started again.