Moved website but theme lost

I have just noticed that I cannot access the admin page too on https://voiceofafricanwomen.com/wp-admin/index.php

I wonder

Did you backup the site before you upgraded your blog? Do you have a backup on your computer that you can reupload?

Also, can you see the correct theme in wp-admin/ Presentation? I’ve had to reset my themes before…

I have just reuploaded but the problem is still there.
I don’t know where to

see the correct theme in wp-admin/ Presentation

Please help