Hope you’re well,
You are currently listing your all the posts with category blog, this page is called category archives and you can find all the editable content for it in Theme Options >> Pages Settings >> Category Page
Your best way would be creating a page called blog
adding a sidebar widget and a posts block to add only posts with category ‘Blog’
by giving that section “blog” an Id, you would be able to manipulate the colors, images sizes by custom CSS which I would be more than glad to help with.
and selecting the category and type would be from the posts block itself.
Let me know if you need any help.