The site is down after VPS server restart

Hello I restarted the server from Plesk Panel and it didn’t come up.

Then I talked to hosting support and they told the systems are up and I succeded to login to Plesk Panel again, and seen also that all my other websites hosted there are up, besides the website.

It is based on WordPress and has alsow second installation for upgrade development under, and separate DB.

What can be the issue? Can you suggest any help?