It would be easier for you to add there plugin for whatever cms you use, there are plugins for wordpress, phpbb etc.
https://www.cloudflare.com/resources-downloads
Presuming that was a ddos showing in your stats and its hit max bandwidth I would change VPS provider.
https://www.cloudflare.com/resources-downloads
Presuming that was a ddos showing in your stats and its hit max bandwidth I would change VPS provider.