Error 404: the page you requested was not found

my site is https://sanjal.co.uk/blog/

very bizarre thing happened to my site today.

suddenly all my posts disappeared, I have around 250 post and now it shows 0.(it shows 0 on wp-admin and also on site)

also all pages are gone, every time I try to access I get either error 404 or no posts matched your criteria.

but surprisingly it shows my posts on homepage but when I click on it give me error.

so far I have tried:
– inactivate all plug-ins and reactivate them
– change theme to something else and back to my original
– change permalink settings

but no luck…and I think I am stuck

can you geniuses please help to solve this.

thanks in advance