Synchronize Analytics for established time periods

Greetings,

We are currently using the Personal edition of "Analytics Plus" in our company, and at the moment it was working well until the limitations of rows and tables arrived by the software itself.

I understand that Analaytics has its own database that imports from ServiceDesk, we currently have the following data usage:

(We are OK with everything apparently, but the sync doesn't work)

We have tried to synchronize from a more up-to-date date, using the "Initial Data Synchronization" option, but it doesn't refresh the information in Analytics:

It seems that despite being doing this, it keeps the same data imported before the established date, throwing the following error:

I would like to know what is the procedure to eliminate the remaining data, and start from scratch (due to license limitations), since we only need statistics monthly and we aren't interested in losing the historical record.

I will be grateful if you can send me this information.

Best regards,