Hi @AnuradhaV,
navigate to the Developer portal to see your instance's status:
https://developer.servicenow.com/dev.do#!/manage-instance
More details here:
[GF#5] PDI in Offline state: Resolving Error 502 Bad Gateway
There's no support so if you don't manage to wake it up, then you might need to release and request a new one. NBut all your data or progress will be lost.
PS: is it a PDI or lab instance during a SN University course?
