Today, make a list of big, audacious actions you would love to take, but, for whatever reason, have not. Then, pick one, and use that as the starting point for your writing today.
Or, part two, if you like: look at your list of big, audacious actions and next to each item on the list write two things: what might happen if you actually did that thing and what is stopping you from doing it. Voila, many more topics for you to unpack and write about, which you can save to your main ideas file and use when you please.
(Also, bonus if you actually attempt one or two of the big, audacious things on your list. Or at least tell someone about wanting to do them.)