@theresem: To show all blog post in the page, there is 2 options.
1. You can edit your page and assign that page template as “Blog”. For this you will see “Page Attribute” box at the right bottom of your page editor.
2. Or you can add assign your Blog page in “Posts page” at “Settings => Readings”.
@theresem: The command [archive] is not theme shortcode. I think previously you had plugin to show that archive and now it seems like that plugin is not active in your new site. So, check for the plugin.
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