Framing and Sub-Flooring - Uneducated Framing Question

Hello: I have a quick question about framing, snow load, and insulation. I have a story and a half house, the upper half has one bedroom. In the bedroom the ceiling is short, around 6.75 feet tall. That being said, it is an orthodox square room for all intents and purposes. However, due to my height, I was wondering about the process of possibly raising the ceiling frame so I could reasonably sheetrock the room. Since I am from MN, I know that snow load must be considered. The frame has the insulation is stapled in between the segments. Basically, I would like to push it up a foot. Please, as basic as possible. I mostly do electric, plumbing, and finish carpentry DIY work round the house, and might not know particular verbiage. If it's something I have to solicit a contractor for, please let me know any talking points or research I can do on the current frame to locate an adequate resource. TIA! Any responses are appreciated.

If you have a Cape Cod style design, and have somewheres near a 12/12 pitch roof, - then the load on the roof lessens as the steepness of the pitch increases. The reason being, illustrated as such: If you carry out the logic to ridiculousness, and the roof starts almost pointing straight up, the load transfers to the walls.

That being said, those ceiling joists that are at the 6'7" height, that you wish to raise, would be "collar ties", which tie the rafters together and serve a few functions: ties rafter to opposing rafter preventing any uplift seperation at the peak, creating a truss type of strength in the middle to combat loads, and also serves as ceiling joists for second level of home.

However, with stepper pitch roofs, there becomes less concern for the rafters to belly inward, under load and snow load at where the ties are located, in a relation to the roof pitch.

You may be able to raise those ties a foot, if your roof pitch is steep, IMO. But I'd like to get more feedback to try to understand why they did not already build it with that additional foot of headspace. If the roof pitch is not steep enough, you will not be able to do it!

If you wanted to take any pictures of the house and up in the attic, looking at the rafters and collar ties, that be neat.

I'm curious as to how long ago this was built, and was a permit used? It probably was, that's why the rafter ties (on the top of walls) are where they are. Waiting for pics, also. Be safe, G