try disabling stuff
#Ping - Crash
quick cobalt
like plugins
sometimes it could be plugins causing the ping
also check cpu usage for the server
fathom solar
Ddos
slender plover
Since you are renting from a host instead of hosting it yourself, you are at the complete mercy of their control. If you decided to host yourself you would have full control and choice over how your server is ran, and in return you would be able to diagnose why everyone's ping is skyrocketing.