Traveler? Photographer? Do you need an app to find the best photo spots?
My stats say that only ~1 person of 200, clicks on the iOS or Android store button to download the app.
I used Hotjar in order to see how people interact with the landing page, and I just see them scrolling and closing the page (with no click on "DOWNLOAD").
The NoFilter landing page is: https://getnofilter.com
Why do you feel people are not interested in? Even considering that they land on this page from Instagram Ads which explains that this is an app that helps travelers & photographers to find good photo spots. The landing page explains the same thing (I guess), so, they should be interested.