from my advice rural properties and developments aren't successful and you are climbing an uphill battle. sounds a little niche. we focus on developing and not reinventing the wheel. if this is truly what you want to focus all your time and energy on then visit the closest 5-10 of these that look like the ones you are interested and ask if they'd expand or build a secondary one. do a lot of research before you just take action 

There’s zero chance I would move out.

Bigger Pockets is a great place for education and networking and is full of great content.I recommend that you check out the following resources:1.

They'll have the same issue with the next buyer and you can always come back in a few months and make them a much lower offer once the property has fallen out of contract a few times and they are extra motivated to sell.   

It was kind of a bad spot in my life at the time.

Feel free to reach out if you have any questions about the local market here or want to connect! 

Tenant does not want a rent raise so opts to move out. 

Allen, go out of your local area to invest.  

Rent out the ADU as a STR (7 day stays or less).

There's a lot of pitfalls there that you're probably not going to be aware of without experience.