How can I make my living room feel more comfortable and inviting?

My living room feels a little plain at the moment, and I’d like to make it more comfortable and inviting without making it look cluttered.

I’m considering adding a rug, better lighting, cushions, artwork, plants, and possibly rearranging the furniture. I’ve been looking through different home decorating ideas and found some helpful inspiration at https://www.sundayabode.com/

What changes have worked best for you when creating a cozy but still organized living room?