Need Suggestions

I have this empty space upstairs and needing suggestions on what I should do with it. Originally my husband and I agreed this to be my media room to myself but idk yet. What should I do? How should I decorate it? This room hasn’t been touched at all excepted I changed the light fixture and it needs painting. What color should I paint it? Help me out below!!!

I have a dining room and living room separately downstairs.

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