Davros. I have no hesitation in telling you that this is easily my best Soulslike - 1st playthrough. Jury is out on repeated plays.
Given that a) you've always played them solo, and b) you rate Bloodborne the best (as did I) then I am 90% confident you'd agree.
It nails the brutal, mysterious adventure vibe so hard. It distills its systems to their purest form, and although some see that as a drawback (and that's completely fair) I see it as the Best Thing.
Most importantly, it's different enough from the template to feel new and dangerous, which is fucking excellent.
Oh and it has the fairest, most satisfying and epic bosses (for me) in all of the (pseudo)series.
If you take the plunge, you know this thread got your back.