So, this isn’t my realm of recommendations besides BL knowledge, but I’ll try my best.

There’s a futuristic dystopia manga No.6. Note that it has an ambiguous HFN.

Blood Bank by Silb is a dystopian/futuristic manhwa where vampires rule the earth. Note that you’ll have to make an account to read this and to make sure you change your settings to allow you to read 18+ content - you can’t do that from the app, you have to do it from the desktop first.

Hopefully someone who reads more graphic novels and such can help! I do recommend looking into tapas, webtoon, etcetera.