My wordpress website data has been lost

Ive been working on a website with Themify theme on it. But in a process of changing the skin of the theme, my landing page became default of the theme. i also cannot find any revisions of the page for some reason. So i wanted to restore my website to the day before that event. How should i do that?

This is not Cloudflare related and a question for your host. Maybe they have backups.