Hey there, I'd be super interested in getting something going with you! I'm 27F as well, in the states, ~15 years experience, and usually write somewhere between Casual and Low Advanced! 

There are SO MANY of your ideas listed that I'm interested in! I'll just list a few and if we wanna go with whatever you like most, I'll be pleased :) 
- Ranch & Farm life, maybe combined with a forbidden love or enemies to lovers or family saga trope? 
- Wild West or American Colonial or Civil War era, honestly could go anywhere with these. Nomadic lifestyle, crime family, culture clash, etc.
- Serial Killers - down for anything with this!
- Arranged marriage - down for anything with this as well! 

I have no preference between playing male or female, I'm happy to take on whatever you're not as partial to! I'm totally fine with using Discord, and I am big on OOC chat to spin ideas, gush, talk about vibes and inspiration, etc.