WordPress has got reset

I have a website https://www.freshnewsarea.com. In my website all posts are deleted. At Night my website was alright but in the morning i opened it place of new installation was coming. I got worried and install my backup made a day before. I installed it and my posts were back. Then when I logged in with my admin password then saw that all plugins were deactivated. Then I activated my plugins and then again it came to its normal place and also everything was reset again and I am not able to understand what to do now.
Please tell me a way to solve this big problem
I have tried the way given here
https://paulstamatiou.com/how-to-quickie-repair-mysql-tables-in-phpmyadmin
but no help