this is interesting to read. i'll say personally i like makeup but it has never been more than a hobby and occasional money making opportunity. for me pursuing my group fitness instructor passion is probably more similar to how you talk about makeup. for me since i've started teaching 7 years ago no i've never wanted to just give it up. over that time i've constantly taken training, honed my skills, learned new formats and changed my schedule around. i still feel excited about it even if one day i feel blah and would rather veg on the couch (those days are rare though).
maybe you can change up your focus, take a class, even in another city learning something vastly different than you've done before. maybe you should focus on a complimentary thing, like photography or fashion, etc. that might get your juices going again.
i'm not really sure because i can't really relate but i hope you get your passion for makeup back.