How to change your interior when everything you own is colorful?

This room is never going to be neutral

I suppose a bit of silver polish would be a good start

The white light from the window is not a filter or a trick - it is genuine authentic Peak fog

Sorry I do not have any answers to the question in the title. I am really asking. I have mostly very colorful art, and two purple chairs as well. I suppose I could change the flowers and the pillows, and possibly recover the purple chairs. Just feeling like I need a change but I live in a rental house so I am stuck with the floors and walls. Any advice?