1) a startup developer should be a good developer. Startup is not a place for an average developer.
2) a startup developer should have "get it done no matter" what attitude.

You are WordPress developer so I assume you have well designed and well developed website. Have you seen any change in traffic patterns on your website ?

Take a step back and try to answer "Do my potential customers know about me?" "How will they find my product?". Answering these questions may open up options for what to do next.

Finally, read up articles by Neil Patel; he is a growth hacker worth reading.

Happy to talk further.