Where can I promote to my users an additional service

I have essentially created a marketplace however I want my users to know they can & should request custom deals.

Is there some kind of pop up or highlight feature I can use?

Here is a video I have placed In dropbox

Hey, the video file you are referring to is not working. Can you please send a couple of screenshots so that we can help you?

By the way, you can use one of our form blocks so that the users can send any type of request. You will learn how to configure it here: Layout: Customizable Form – Softr Help Docs