Redirect subdomain to domain

I’m trying to redirect my blog posts on subdomain blog.thewanderfulsoul.com to thewanderfulsoul.com. For example, I need https://blog.thewanderfulsoul.com/2017/01/how-to-be-more-present-while-traveling.html to redirect to https://thewanderfulsoul.com/how-to-be-more-present-while-traveling-in-life/, but it’s redirecting to a 404 page on blog.thewanderfulsoul.com. It says “This will be converted to a server redirect for the domain blog.thewanderfulsoul.com.
Some servers may be configured to serve file resources directly, preventing a redirect occurring.”