Hello,
1, 2, 4, 6/ Have you checked transaction of the XStore Core plugin? https://www.8theme.com/documentation/xstore/theme-translation/base-theme-translation/
3/ Theme Options > General > Enable Classic Widgets Panel > On, then go to Apearance > Widgets > Cart area
5/ Use SEO plugin to add the necessary OG image and OG description for your pages, posts, products. Try for example Yoast SEO plugin.
7/ Check settings of Products element, you may find the limit option. Or provide temporary wp-admin access, so we can take a closer look.
Regards