I’m smack-dab in the middle of multiple books (The Guardian of Hope series is not all I work on). And it’s hard. Middles of books are hard. But of course, being in the middle of anything is hard.
If you’re not athletic, imagine starting an exercise routine. Initially? Super exciting. You’re pumped to do it, and you often notice drastic improvements quickly. The rate-of-return in exercise is massive at the start. Then a few weeks go by, and the drive is gone.