Some websites do a great job of getting your attention for a product but gives the user the power to get rid of the popup at their leisure.

I stumble upon this site where the developer has created an awesome “engage” box extension. Click below to see what I mean.

https://www.tassos.gr/joomla-extensions/engagebox

In the “Demos” box use the drop-down to see all the different types of popups there are.

I hope this helps someone else out there….