Sounds like it's time to spray Clorox all over your guitar.
(I'm kidding. Do Not Do That.)
To add onto what everybody else already said, it wouldn't hurt to open the case every now and then and go over the fabric with a hair dryer if it gets too humid. Sometimes moisture can get trapped in the padding.
"If at first you don't succeed, don't go skydiving."
"When I want expert advice, I look at the comment sections on DIY videos."