Fold3 5G, I charge to <85% nightly and it almost always lasts me all day from 6am to 11pm.
I’m not a super light user, but my screen on time is nowhere near yours, 7 and a half hours screen on seems crazy high to me. I usually come out at 3 to 4 hours.
I keep the screen brightness down, wifi and bluetooth are automatically on and off only when needed, very rarely receive phone calls or video chats so that’s saving quite a bit.