Hello, @Niddy,
Thanks for contacting us.
I have gone through your issue. To set the block above the cross-sell please go to the Dashboard >> XSTORE >> Single Product builder from there you can set the widgets in sections as per your need as I set, you can see in the image using custom HTML widget/Element you can set the static blocks in it and move the widget/Element on the row you want easily see this image: https://postimg.cc/dLpkW4VH and here is the resulting image https://postimg.cc/p98DQ3QJ please note that if your issue is not resolved by following the above guidance the please share your site wp-admin URL and access in the private content area so that I will check and fix it for you on your site.
Regards 8Theme Team.