While I obviously cannot see how you've laid out your pages inside WordPress, I can offer some suggestions based on similar situations I've been in.
You'll need to use White Space tricks like these:
<br /> surrounded by non-breaking space which is an ampersand ("&") followed by
In the right sidebar, immediately above the widget for the ad, add a
Text Widget using one of those tricks.
Likewise your archive page, whether it is in a Page or a Template.
If this ends up meaning changes to Templates, be sure to create a Child Theme so that Theme updates don't wipe out your changes, and use the following to help you identify the appropriate template file:
Child Themes are explained here:
I also found this plugin helpful: