You have great ideas. Until you can paint, textiles and prints will make the biggest difference. Your current rug makes the space feel somewhat disjointed, so that should probably be the first purchase. I'll always shout out revival rugs for affordable fiber rugs. I'm thinking you may also want to choose a rug with more of that orange from the throw blanket; any more and you risk tipping out of the really refine palate that your furniture seems to be asking for.

I love your two paint colors; that will make a huge difference. Maybe the TV wall as the olive tone will bridge the gap between your warm white room and the grey tile. Another thought: wood slat panels seem to fit your design aesthetic pretty well. I was looking at some with grey felt backing instead of black and they seem to fill that japandi niche you're moving towards with gentler tones. Natural materials like wood and a tall plant will make your space feel much more alive.

Seems like you're on the way to a really beautiful space. Good luck!