Search Engine Visibility Zero Robot text

I have a website hosted on bluehost, it is 4 years old. In September I ticked the box – search engine visibility off. I changed a few things and then a month later in October I unchecked the box. According to the access log, there has been traffic up until I unchecked the box, until October. Something happened a glitch. Now the website cannot be found, the only way I can go to it is by typing it into the address bar directly. Because the website is 4 years old I had always been listed in Google or Bing, had quite a few photos in image search as well, they all disappeared and all traffic ceased when I turned search engine visibility back on. I tried to put a google validation code from the search console into the header.php, maybe it is the wrong place, but google cannot validate server unavailable is the message – website remains hidden. Bing message – robot text prevents crawling of the site – but now even this message disappeared. Search engine visibility is Zero. Something is very wrong, I read and followed previous threads, don’t have any idea what is supposed to be in the robot.txt file.

currently it is this:

User-agent: *
Disallow: /wp-admin/
Allow: /wp-admin/admin-ajax.php

https://www.arteney.com

thanks