It would be very helpful if you posted pics - lots of them, of your apartment. We need to see what you are talking about.

There are tons of ways to add color to your environment without painting the walls or furniture. Art, area carpets and decor.

This home has mostly white walls and furniture, but is anything but devoid of color.

Here are examples of small additions of color make a world of difference:

Here are pictures of the two rooms. Please overlook the mess! I’m fall cleaning! TIA

It looks like you have too much furniture in the living room. Can it be layed out better?

I’m thinking about a small sectional instead of what I have

I think blues and greens would work really well with your navy pieces — maybe add a few throw pillows, a rug, or even some plants to soften the contrast and tie the rooms together. If you want some extra inspiration for mixing modern style with cozy details, check out https://victoriayakusha.com/ — lots of creative ideas that could help spark some direction.

A small sectional with an ottoman as a table surface.