Struggling to Find Wallpaper Customers in Trivandrum

I deal with premium wallpapers for interior that come with a warranty which other companies don’t offer. With so many apartments under construction here, I thought it would be easier to find customers. I’ve shared catalogues with architects but haven’t had much success. Any advice on how to connect with potential buyers or market effectively in this city? Also is there any way to reach out to the engineering department of apartments or malls in city. But I don't want them to be feel disturbed.