I love your ideas they sound really interesting, especially the second one!
Aside from writing a sequel for my almost completed story, I have a couple of ideas that I'm tinkering with right now for my second title:
First one was light-hearted rom-con BL where two exes fatefully meet again as new neighbours in London.
My other idea was a feared assassin being entrusted by his secret crush to be a bodyguard for a bratty rich kid who is being targeted. Ends up becoming some sort of love triangle (or not, haven't decided yet).
I have a third one which is like a dystopian sci-fi BL but...that one needs a lot of work and world-building.
So I will probably focus on my sequel first...after taking a good long break, of course. I've been posting daily chapters since end of September last year