The content seems clear, but I'm missing how your product solves the issues you have listed (e.g. "Goodbye, complex platforms!" - I'd add something like "MessengerSell is a super-simple platform which can set up your shop in 5 minutes" or something similar). Not sure about professional copywriter review though.
Online store in an instant messenger (???)
One thing which seemed off: "Instant Shop". I'm guessing this is a previous name of your product and you would want to change it.
One thing which seemed off: "Instant Shop". I'm guessing this is a previous name of your product and you would want to change it.
Good luck! :)