What Colour exactly have you had the roof painted? I work with the Colours of New Zealand palette which you can find in their most recent Dulux colours of the world atlas (or even on line). There is a beautiful grey which could work with your surrounds and the addition of Merbau decking, have a look at NZ2A6 Whakarewarewa. Depends on what tone you prefer as this is probably a little warmer than the greys you have mentioned which tend to be on the cooler side.

Thanks for the opportunity to look at your room and think about what I would do. It has been fun. I think the round coffee table will work if it is large enough for everyone seated in the L sofa arrangement to reach it. (Bonus is no barked shins from sharp corners on a square one.) I agree pale colours like yellow won't do much for bringing about a changed more modern look. The room needs more drama and freshness and I think that currently the room has too many colours in the pale range and not enough contrast. I would go for introducing more of the stronger colours in your attractive tribal fabric, including black and white. Black in particular will allow you to really update the look. Consider painting the bookcase or even the doors black. (The existing coffee table would even look good painted glossy black.) Some plump cushions in the tribal fabric and others in a bigger more graphic design in large red and white zigzags or stripes say, would add to a more integrated look. Your bright yellow pot plant holder on the bookcase is another colour in your tribal fabric which would look good in the scheme as a minor accent, say, more pots that colour in a larger size, a big vase/artwork or lampshade. My advice is to stay away from golds and beiges as they relate to older fashions. A large framed in black graphic print on the wall in black and white (or even photo with meaning to you) could be an idea to think about too.

Suggestions from neutral colours: https://www.dulux.com.au/colour/colour-trends/2018/essential Ceiling & walls the same colour is a good choice for square set. There will be subtle hue difference in various lighting situations anyway, which provides depth and makes for an interesting look.

There are so many shades of taupe it is impossible to say without seeing some photos of your home. I would suggest that you start looking at some light teals and pale aquas, but it really depends on what else is in your home. Best of luck, Dr Retro of Dr Retro House Calls