Creating a landing page and getting 600+ users

I posted here about my chatGPT-powered WhatsApp chatbot and someone told me to create a landing page for it. I didn't want to do it at first but did it anyway. Now I have 600 users. It's pretty hard to convert users though cause only 5 users are paying customers.

Any idea on how to convert them to paying customers?

check it out here: https://sam.deadal.us