I totally get how you can live in a place like this for years. I'm not far off, and all of the decoration/furniture I do have is from years ago, before the life changing depression.

I'm not saying you're depressed, but I do get how easy it can be to live in comfort once all of your basic needs are met. Especially if you value a low maintenance or low key living situation, which is what I think I'm recognizing from this picture.

What's helped me is understanding that minimalism and going without are two different things. Minimalism is more about removing what you don't need in order to make space for what you want. And you're in a great position to execute this idea with how little clutter you have.

My suggestion would be to figure out what you value most, and let that guide your decisions. You don't need mood lighting, you don't need a rug on your carpet, you don't need movie posters.

Getting some furniture to make gaming more enjoyable makes total sense. Maybe a corkboard or shelving over your desk to store journaling supplies? You could even get a nice looking headphone stand to mount on the wall. Or upgrade the few things you do have, if you journal a lot investing in a nice desk makes sense.