make sure when someone finds you on zillow that they find a professional who has their entire profile filled out.
have a good professional photo inserted.
connections listed with your website and your other social media platforms.
all contact information listed - email, address, telephone, and all ways of reaching you.
ask for those recommendations from your clients "while" you are working for them or just before the closing so you can follow up while you are in good contact with them.
explore boosting your membership to a paid membership if you are not getting action from the site.