For me, it would be colour. Maybe a feature wall for walls around dining, or living, pick colour from your favoured painting, and use same and other colours from pictures for cushions or even some occasional furniture in the brightest colour - I saw this done beautifully in a tarted up house for display - a small seat/coffee table painted and upholstered in an orange mix, which was taken from the splashback (everything else was neutral) and also in a throw for lounge.

Lots of good ideas here. If you do have a carpet remnant overstitched along edges, be sure to specify the thread is to MATCH the colour of carpet. I know this sounds like a no-brainer, BUT we had long and wide carpet runners made up, colour was dark brown. When we unrolled them, low and behold the overstivhers had used WHITE thread. We were stupefied. Who knew one must specify the obvious! Anyway, hubby had a brilliant idea: he used black magic marker and carefully coloured over the white. You would never know it had ever been anything but!

You obviously like the sofa because you bought it for a room that doesn’t get used?... Because the sofa has no “texture” or warmth to it, you will have to bring texture and warmth into the room with cushions and natural pieces. The shiny coffee table is also not adding any warmth to the room. Again you must like it if you purchased it. I would add cushions with lots of texture as per photos attached. Bring in rattan pieces as well. A rattan serving tray in the middle of coffee table, a rattan plant stand for the corner. Install sheer linen curtains over the blind. Again the blind is not full of texture and warmth. Adding a sheer curtain would make a difference. Look at photos on google “minimalist boho lounge rooms”. See if you like that decorating aesthetic. It seems at the moment every thing is shiny and bland.

Hello, I'm not a specialist, and I don't know if I can give you any good suggestions. However, every time I change houses, I work with a property buying company. They are the best ones in this domain, they aren't designers, but I am sure if you'll contact them they might give you some tips or someone to get in contact with to solve your problem. If I have to be honest, I won't make changes like this in my house, and I would choose to buy another one or change something inside my house. I'm not a fan of reconstructions. That's why I'm a little reserved about this topic.