Menu and features changed

Two weeks ago a lot of features on my Word Press dashboard, writing post page and social media menu on my blog, and related posts link, disappeared. I no longer have the spell check option when I write a new post. There is no longer a related posts feature and links at the bottom of a new post. My social media menu disappeared on my blog. My site analysis dissappeared on my dashboard and is not an option to check in the screen display menu. And my theme, which is 2016 flucuates everyday from being indexable to non-indexabe by search engines. It seems like an update happened and now these features are gone. I can’t make sense of it or know how to fix it. Do I have to redesign my blog with a new theme? Or does everything need an additional plugin to work?

The page I need help with: [log in to see the link]