Domain Redirect Led to Broken Site

It seems I’ve made a mistake… I have kevindonovan.wordpress.com which for years has used blurringborders.com. Tonight, I went into the General Settings and sought to redirect it to kevinpdonovan.com (which I also bought through WordPress and has previously redirected to blurringborders.com). My goal was to make kevinpdonovan.com the main website, not blurringborders.com

The result is a problem:
(a) kevindonovan.wordpress.com still redirects to blurringborders.com,
(b) kevinpdonovan.com still redirects to blurringborders.com,
(c) blurringborders.com lost its theme,
(d) and when I login to kevindonovan.wordpress.com or blurringborders.com, I no longer have access to the admin stuff for what appears on blurringborders.com, rather it is the material for an older blog that used that site but I deleted years ago.

I hope this is clear — it seems a bit difficult to explain.

I would either like to revert to the prior status quo. Or I would be happy to just have blurringborders.com redirect to kevinpdonovan.com and to be able to rebuild (from the ground up, if necessary), kevinpdonovan.com. However, since the admin site for kevindonovan.wordpress.com is the anachronistic material, I’m unsure how to do so.

Thanks!