Could you post more photos of the space? Take one from the doorway, then of all four walls.

Why is your couch not working out? You can design a very nice room around it. In order to help you I need more pictures.

Find your fixed features of your home. i.e. Fireplace, large windows, then place your furniture to open up to your fixed features

Don't get a sectional as you'll be forced to face the sectional only one direction. Which will ignore the FP. I'd go for sofa and two chairs or two sofas facing each other.

Someone had the same question yesterday! Her is my answer.

When you buy a sectional you need to know

Do I really want to sit that close to visitors while we are watching tv?

There is always a side that won't be used (the side that does not face the tv) because it is uncomfortable to have to turn your neck to watch tv.

No one, except kids really sits in the corner spot because it's not comfortable either. People tend to lay there instead. Family will do it sure, but some visitors/friend won't by respect.

Re arranging furniture in the future will not be an option.

If your space isn't huge, not just big, it can look massive.

How much space will be left to navigate around.

Hope this helps!