Yesterday Bing suddenly deindexd all my indexed/ranked pages

[quizzesx]

Yesterday Bing suddenly deindexd all my indexed/ranked pages of my website Bingquizzes.net. 

site:bingquizzes.net

my website is performing good in bing good visitor and impression but i dont know suddenly it deindex all my index page. 

it is really horrible thing lots of hardwork i have done for so meny days and all are gone. please suggest some solution.  

still bing url inspection showing my website is indexed 

[#2]

my website also de ranked now a days i don't know why? but still i try to rank. please review my site : ( https://www.forkliftbatterymanufacturer.com/ ) ( https://www.lithiumbatterychina.com/lithium-ion-off-grid-solar-battery/ )