Oh, yes, September...I can so identify with time moving faster and feeling I have not accomplished what I should. I would also definitely miss the change of seasons! I really empathize with you on that. At my age, I've realized I'm in a kind of "mourning" stage at not having accomplished some of the things I had hoped, but not in a depressed way, as you also say.
For me, the holidays are just too commercialized to be meaningful. I abstain from most of it for that reason, only in the past couple of years, recognizing how they are driven by economy and not spiritual meaning.
Love
Patty