Try to contact your internet service provider and tell them about your problem, they might help you. If you have a cable internet as i do, try to get fiber optic wire it will provide you better ping. If you have wireless internet, there is no solution else changing your provider. Also try to switch off all resources using internet. If you have WiFi, try to add/change password so no one else can use.
Regards,
Bun Bun!