Since Star Citizen is such a huge success with their crowd funding, maybe you could take a few pointers from them.
For example, like the ships in Star Citizen; you could work on different horses backers can but or perhaps even highly detailed armor for purchase. STRICTLY FOR PLEDGING! Don’t become another EA. Keep your morals good.
I suggest working on detailed armor, or creating revolutionary design/game changes. Work on a possible multiplayer? Perhaps a small skirmish of people fighting on a battlefield or for a castle? Simple Co-op? If you are already doing this I am sorry, new to your game.
It’s a stretch but these are just my ideas. I am running on no sleep, so please forgive any grammar mistakes.
Good luck!