Your current sofa colour works with the warmer tones of your rugs and wood furniture. I’d change the wall colour instead of the sofa colour. My vote would be to replace the verticals with a blind to match the trim colour and then add white toned sheers on both walls.

I think that sheers and blockout curtains would work well. Keeping the roller blind on the window, as you have mentioned. The sliding door must have curtains, not a roller blind because it will just get in the way. (When exiting and entering through the open sliding door.) Ensure you have the curtains opening the correct way. The door latches on the left, so have the full curtains installed to be pulled open to the right.

If you match sofa to the grey it might be very bland. R u removing the blinds and putting both shears and blockout curtains up?

I am keeping the roller blinds, thinking of just incorporating dimming curtain over the roller blinds.
The sofa

I have to change to modular sofa otherwise I can’t move TV to the wall. Having block out and sheer over the roller blinds will be too expensive, just thinking of dimming curtains over the roller blinds.

Before you commit to new window coverings and a new sofa spend some time creating a mood board on Pintrest. It will help to get a cohesive look before you spend money.

Thank you will definitely check it out.

Over the roller blinds, have block out curtains. (I don’t know what you mean by “dimming” curtains). Since the roller blinds are not block out, It appears you need the block out curtains for privacy at night time, and for keeping the hot sunlight out of the room during the day. If you are removing all of the verticals, then sheers with block out curtains would work. Or, block out roller blinds with floor to cornice sheers. You could have two block out roller blinds on the sliding door, so one can be raised for entering and exiting. Then floor to cornice sheer curtains, pulling back to the right. It depends entirely on your budget.

Block out curtains has a complete 90% whereas dimming curtains provides 70% light filtering effect, explained by some curtain manufacturer when complete block out is not needed. Thank you for the ideas much appreciated.
I have two sample of ready made curtains from freedom one is sheer silver and the block out is also of the same shade. Any suggestion on any other ready made curtain supplier, looked at IKEA but not sure if the material would give a luxury finish.

Like all ikea products you need to sort through to find the gems. Some of their curtains are quite good.

Spotlight has a range but they are often too short to give a luxury finisher. If you’re a fan of Amazon their linen like blockout curtains get good reviews.

Thank you for your help Bigreader… much appreciate