Unless you see substantial weight loss, I wouldn't worry. It sounds like he is fasting from winter or maybe detecting the fires. 2 years old sounds like he's reaching that age where they just have girl BPs on the brain.
I bought an adult breeder male this time of year who only ate 20-30g of live mouse at a time every 1 to 1.5 months for the first 5 months I had him despite on-point husbandry. He was "in the mood" and didn't want much food until March. He lost maybe 100g or so overall out of about 1400g, which isn't much. He put that weight back on pretty easily in March eating only small rats.
Sorry to hear you've lost your vet, though. Sending good wishes your way!
For humidity, maybe hooking up a basic humidifier like you use when you're sick with just water and put it on a basic timer to come on for a bit every hour or 2 overnight by the cage could help? I havent needed it or tried it, but that's my tentative backup plan if I need to boost humidity in my snake room.
Sent from my SM-G950U using Tapatalk