Bing is not indexing my site: Anyone Help plz

It's been a few months my site is indexed in Google. There were few URLs indexed by Bing too but they have now deindexed and I have requested them again and again but no results.

I am sure there's nothing wrong with content quality or anything else. I am not sure why they are not indexing my site.

Here's the link to my site laptopfirst . com