I need "a day"

One of the mantras I say to my wife about my life is, "I need a day." This reflects the desire to dedicate time to get something done I've been procrastinating on or start something enjoyable without other obligations looming overhead.

When I envision having "a day" to myself, my desire is towards creation. This blog once served as an outlet for being creative and interacting with others, yet is blogging even a thing today? The urge to write another book, this time with more dedication, frequently crosses my mind. Also, I consider revisiting art, a once significant part of my life, or venturing into podcasting.

However, the challenge remains: to begin any of these creative endeavors, I first need a day.

What would you create if you had "a day" to yourself?

Do I need to set aside a day just to plan another day, to then decide what I'd do if I had a day?