Trust yourself, Thimble. If you don't feel you want to get better - take as much time as you need but stay in therapy. Your therapist should not be pressuring you. There can be a lot of reasons why it might feel "unsafe" to get better.

You may want to shift focus of your therapy from "getting better" (becoming "happy") to something like "doing OK where I am right now".

The whole idea of being perky and happy as a standard for a "healthy" person (as in antidepressants commercials) is ridiculous anyway.