I wish you luck. I am in the same position. I have a working game that my friend made that I picked up and modernized and have been improving tremendously for almost a year or so (alongside my sicknesses and whatnot), but we have no clue where to begin spreading the word. The content may not be enough for it yet. It is playable with some bugs here and there, and work is needed on the map generator and the AI, but yeah... We have some great screenshots, too, and some ideas as to what else we should present on our Patreon page.
If anyone has any ideas in particular, feel free to let me know, please. :)