App monetization

I am doing low code directory apps that are used as a lead in when I cold call businesses. My primary offer is a local direct mailer. I am creating a directory app for each mailer linked via QR codes in each mailer.

When calling businesses I am finding they are more interested in our directory apps and their listing than my mailer. I am thinking of re-positioning my pitch to where while I am calling to confirm their basic business listing, they may upgrade to a premium listing with top positioning, logo, images and coupons included for a nominal price. I will also be creating a comprehensive package that includes the premium app listing and an ad spot on my direct mailer as a sales bump. I am thinking $35 for the premium app upgrade alone since the app's major function is lead generation. How is my pricing?