Treating or coping with at least novel postpartum depression might call for a ritual that includes some celebration, some distancing, some new explorations for creative vision inspirations.
Celebrate completion of the novel. Take a trip. Go to a social event, like a fair, a carnival, an art show or some other creative endeavor, like a BYO booze evening pottery class. Get out and experience new horizons. The writer persona will kick in from observing people interacting as people oblivious to their idiosyncracies. Fun stuff. Inspirational stuff. Puzzles to deciper. Meaningful problems wanting satisfaction.
Narrow in on a writing technique or principle that emerged while writing the novel, again, exploring new horizons. If you've got craft well in hand, work on voice. If you've got craft and voice well in hand, work on audience appeal and accessibility. If you've got the latter in hand, cycle back to craft. Maybe even cycle back to mechanical style. I learn new principles of writing's basic grammar and punctuation regularly. The mechanical principles have a well-defined parameter of convention. However, they also have variants that, when artfully deployed, influence impact, intent, and meaning. Commas are a trial for any writer but, when considered for their explicit dramatic purposes, they can be judiciously and timely replaced by em dashes, ellipsis points, question marks, or parentheses for stronger emotional impact and ease of interpretation and expressing meaning.
I don't have a problem with finding inspiration. I have a running Inspiration notes file that's decades old, filled with this, that, and the other. Just reading your post gave me an inspiration about the postpartum doldrums a writer has when a project is put out into the world to sink or swim. The entire emotional investment is spent and the self is adrift in a beginning again that was so long ago. I asked in what way might that situation be reinvented as a core dramatic complication, a problem wanting satisfaction that an audience might find common cause with. For example, instead of a writer, the central persona might be a warrior forcibly put out to pasture after a lifelong military career. He or she is adrift from the existential crisis of loss of identity. I started thinking about several science fiction and fantasy narratives with a similar theme of an individual and society, and an individual and alienation. Mental perambulations opened up a horizon that I'll get around to developing once current priorities are satisfied.
Spread the love of written word.