Changing ecommerce to normal website

I want to delete eCommerce elements from a template I purchased (and invested hours customising) so I may use it as a normal site with CMS, but it seems I cannot.

My biggest concern/question – will I now have to pay the premium eCommerce subscription to host this website? Or will I be able to pay a typical CMS subscription?
Also how to delete the e-commerce pages.

When a project has had E-Commerce turned on all the elements and functionality is added to that project. There is not a switch you can use to remove them. If you don’t enable a e-commerce plan then those functions will not work. You can still use the site nevertheless. You may wish to contact Support to see if they can “switch off” e-commerce for you. I recall it being possible to do so.