Lost posts after moving domain host

I was using WordPress.org earlier this year to run my blog. I was unhappy with the store functions so I moved my domain (courtneylestrange.com) from WordPress to square up. Recently, I created a subdomain (blog.courtneylestrange.com) and reopened WordPress because square up didn’t have a blog option. When I logged into my account, somehow many of my posts were missing. At some point I think I got confused and I now have 3 sites listed under my WordPress account, 1 is my subdomain i use, another is blank, and the last is what I was using before. I searched all my drafts, trash, and only some of my posts survived. However, I’m able to google the titles of my articles, but they lead to my square up sites 404 error. They must be saved somewhere. Help?