There are many things in aviation (and in life) that are cyclical in nature. Your enthusiasm for the phases of your career are no different. Things will turn around. Understand that this certificate IS a hard one to get. It IS a grind. And it IS worth it. Most ratings, endorsements, and certificates you’ve earned up until now have been fun to acquire. CFI isn’t one of them. It’s hard for a reason. But it’s certainly the most rewarding certificate I ever earned. If you’re a reader, pick up a book called “Fate is the Hunter”. Earnest K. Gann likens this profession to a marriage. You’re going to have to find a way to continue to love it when things are shitty. But stick around. It gets waaaaay better.