You have about 6 seconds maximum to impress someone who is browsing for a new home. Think about that: 6 seconds! Not 60, 6.
Pictures are the key to getting people interested in your place. What is it that calls attention? Neutrals, space and light. That simple. Your challenge is to work towards acquiring neutrals, space and light. Start cleaning up, ditching stuff and giving away stuff. Take pictures while you work and compare to what you see online.
Think of it as a great opportunity to travel lighter in life from here on forwards. Have fun!