Tbh I find my 27" way big enough, I keep seeing all the new big screens and thinking you'd have to play games from the other side of the room to see the full screen
I feel like my 27 inch is the minimum. Preferably I want a 34" ultrawide as my minimum but it's not greatly supported so I'd rather have a 16:9 34-40" size.
I used to play on a 32" and it wasn't a big deal for me tbh. I'm nearly blind so it actually helps me
I use a 27 inch curved display at 1080p I find it just about right, I did try 1440 but everything looked so tiny my 55 year old eyes struggled with it.