In the Instagram direct you can show a fixed menu before the person writes: buttons that answer what almost everybody asks, without tying anyone up.
How to write the buttons

Write it the way the customer would askHow much is the kit? works. Commercial information is a department name — nobody taps it. The button is their question, not your internal org chart.
How many

A long list does not get readEight buttons on a phone screen turn into a block people skip. Three to five cover most of the direct — and to pick which, look at last week's inbox.

The answer
Every answer should end by opening a path. The kit costs R$ 249.90. closes it. …— want me to check whether it is in stock for your city? keeps the person there, and that is where the sale happens.
Testar
Testing it