In order to use the new tools like keyword clustering, you have to re-subscribe. We have completely overhauled our system in order to be able to introduce more features faster in the future. In doing that, we had to change our payment partner. We have migrated your current subscription, but the new features are not included in the old subscription model.
As a Thank You for your support as an existing customer, you can access the new Pinterst tool free of charge and you can test the keyword clustering tool with a free trial.