I am tasked with optimizing an existing sites SEO. I have added meta's to all the menu pages, however they have blog section with over 700 posts. How important are meta descriptions when it comes to a websites blog? Do I need to take the time to go through 700+ blog posts and create unique meta descriptions for each one?

Is there a specific header tag you were told was hurting your site? It would help to be able to see that. You should write naturally with keywords in Headings if relevant. Are you keyword stuffing your H1?

Our company wanted to experiment on whether it truly is more beneficial to use Yext for citations rather than to do them ourselves. The thought process here, is that when we manually do the citations, some of our listings would increase in quality. The problem we have been running into, is that Yext has exclusive deals with nearly half of the sources we were previously listed under. Is there a way around this, or is Yext truly worth the cost?