Help Moving Blog to Root

I tried to move my blog from a subfolder to root and am locked out of wordpress.

The site was viewable at https://www.mystie.com/blog
However, I wanted to have viewers see the blog at: https://www.mysite.com

My Blog files were located in my subfolder “blog” or /blog

I tried to follow instructions found at: https://codex.www.ads-software.com/Giving_WordPress_Its_Own_Directory

To start with my WordPress address(URL) AND Blog address (URL) were both https://www.mysite.com/blog

I did not change the WordPress address(URL) since I planned to leave all of the files under /blog
I did change Blog address (URL) to https://www.mysite.com

I then moved files index.php and .htaccess
I edited index.php line from (‘./wp-blog-header.php’); to be
(‘./blog/wp-blog-header.php’);
I put “blog” since that is where I left all of the blog files.

NOW: When I go to https://www.mysite.com I can see the blog and the template is still being used but background is completely white instead of all of the graphics from the template. Also, everything is not layed out according to the template it all just goes straight down the page. For example in the template there is a blog calendar on the right now it is at the bottom of the page below all of the posts.

I would try to change everything back but I can’t get logged back into WordPress. I go to https://www.mysite.com/blog/wp-admin and I get a username and Password field but after I type them in I get an error page. I can’t get back into WordPress.

Should I have tried to change the WordPress address(URL) from https://www.mysite.com/blog?

I don’t know where to go from here. I am trying to copy all of the blog files to a folder named “wordpress” and am going to try to adjust the SQL database through phpMyAdmin but I don’t really know what I am doing there so could be a disaster.

Please provide any advice you think appropriate. I am just starting with posts so even starting from scratch is an option.