Recommendations for my next binge-watch please!

I need a new period drama to get lost in. I feel like I've watched most shows and films that I would like, but I'm sure I'm missing a hidden gem. I just need to find it. I like good writing and an endgame couple with charm. Drama is good, but melodrama is not for me. Cosy is great!

I've watched almost everything based on classic novels. So all the adaptions of novels by Austen, Gaskell, Dickens, Bronte, Hardy, Conan Doyle, Tolstoy, etc. From more modern writers, I've watched the Julian Fellowes adaptations, All Creatures, The Durrells, Agatha Christie, Daphne du Maurier adaptations.

I'm not looking for something that's necessarily adapted from a novel, but those do tend to be better. Perry Mason, The Alienist, and Alias Grace were all based on novels. Mad Men is the only original period drama that I can think of that blew me away with its writing, but it was also super depressing and I'm not looking for that atm.

Shows I didn't like are: Downton (too many main character deaths), Reign (just trash), Vikings (I don't like love triangles), Outlander (love triangle and soapy), Poldark (triangle, main character problematic).

Things I've shortlisted to watch so far are:
- Hotel Portofino
- Carnival Row
- The Seaside Hotel
- The Hardacres

Do you think I'll like any of the above? Is there something else I've missed that you think I'll love?