To cancel your service you will just need to:

1.) Ensure you have deleted all droplets on your account.
2.) Resolve any outstanding balance if there is one.
3.) In the control panel under settings click on the option “Deactivate Account”

We’re sorry to see you go.

Hello,

We’re sorry to see you go. You can find instructions for deactivating your account at the bottom of this page:
https://www.digitalocean.com/docs/accounts/profile/

If you have a team account, you can find those instructions here:
https://www.digitalocean.com/docs/accounts/teams/deactivate/

Regards,
Alex