Need help reducing slow queries (by archiving posts?)

We recently redesigned/relaunched a blog (new template with new features) and we’re having trouble determining why there are so many slow queries slowing down the load time. Here’s a link to the blog: https://bit.ly/aUFMD9

Our host informed us that the slow queries would most likely be remedied, for the most part, by moving posts to an archive table in our database. Apparently the site is being taxed by the sheer amount of posts it has to load each time a visitor comes to the site. Does anyone know how to archive posts into a new table?

Thanks for your help. – Aaron