My website not indexing on Bing, core vitals went to 0 after change the webhost

I am facing some issues with coreweb vitals as well as bing indexing, 
I have tried to let bing get the index of the site and with no reason it keeps getting nothing.
I checked if it had the sitemap and it does, also checked robots.txt to see if there was a “no crawl” option, and there is nothing of sorts.
.
On the other hand, the host of the site changed from Hostinger to Wordpress.
After that, the coreweb vitals section went to 0, it used to be very well.
How can we fix that? any recommendations would be greatly appreciated!"