My ideas do not involve altering your living space. Because it is way too much for me to think about or do. I just like to add things.
Place a mat in front of your door. A personalized one is even better. We also have a key hook by the door for keys and dog leashes/collars.
Living Room. Make it cozy with rugs, blankets, and throw pillows. Get a storage ottoman to store the blankets and pillows. You can also use it to put your feet up.
Wall decor. I echo the command hooks. Get plenty of them to hang stuff up. Pictures of trips in the RV are great to hang up. Put quotes on the wall. If you are a crafter and have a cutting machine, the sky is the limit. I know it is corny, but get a map to put all the states you have visited.
Lastly, the smell of your RV. Diffuser with your favorite essential oil. I also like fresh flowers in the RV. I like to burn scented candles. But if you do not like to burn candles, there are the flameless ones that set the mood but don't give any smell.