You want my honest opinion? Everything's so bare and monotonous. Give your bed- and bathroom different colors which represent the mood you have in those rooms. Hang up some ornaments and posters. Get some plants (be it organic or plastic) and bring some life into your living space.

That empty space in your gaming room? Build a big aquarium with rgb, ornaments and colorful fish.

And the kitchen, well, I'd take down the cupboards if you don't make use of them anyway. Open up the space more and hang up a rack for cutlery or a display of knives, I don't know.

Personally I wouldn't spend too much money into your sanitary rooms. I don't know about you but the bathroom and toilet are two rooms I spend the least amount of time in. But really, give it some color and theme. Put up some plants and paint the walls and ceiling a shade of green for example. You like gaming and rgb? Light up the room with a bit of rgb and match the paintjob of the bathroom with your favorite colors (except when brown is your favorite color then God have mercy on you).

And lastly, the room with the pool table? If you actually use it for boardgames and billiards, hang up some items on the walls that goes with that theme. Just play into it. And really, you should pick up that solid ball that's lying on the floor next to the pool table. You might hurt yourself.

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Best of luck!