Old Colonial - a Lot of Rooms - How many Zones?

Evening Everyone,

Started putting my current residence back to 2 family. An Old Colonial, 2 Primary Floors and a lot of Rooms. (And Doors). Basically, both floors have all rooms connected.

Each floor is a Single Zone - FHW Baseboard heat, looped around the outside perimeter walls. (Except for the kitchen - Under-Counter kick space heater.

1st Floor - You have Kitchen, 1/2 bath (hopefully becoming a Full), Dining room, Living room & Den. There is another room, but I am considering that to be a different zone from this post.

Originally, the thermostat was situated in the Dining room (which has a South window), so I believe that was causing false readings and a cooler 1st Floor.

The Kitchen has a hallway, just under 6' from the door to the Living Room & Den. That is where I relocated the thermostat.

Considering breaking the 1st Floor zone to have the Living room & Den as its own thermostat zone. Only have to close the door between Kitchen and Living room.

The Kitchen thermostat would be responsible for the Dining room, Kitchen and 1/2 bath.

Similar approach for the upstairs zone conversion. So, I would be going from 2 to 4 zones.

Am I going in the right direction?
Any feedback greatly appreciated.

Thank You
Be Safe.