Bloodborne to me is the peak of Fromsoft. Loved everything about it.
As for what to follow it with, I'd say Demon Souls, just because it has a more flexible gameplay. And - in my personal opinion- a better setting.
Sekiro is a very stiff game, you have to play it the way the game demands you to, which I personally didnt like.
Dont get me wrong, I think Sekiro is a very good game, just very rigid with its gameplay.
A lot of people like it for that, personally I think it takes away from the experience.
Still, the more epic battles are super epic.