Zoho email migration suspended

Zoho email migration suspended

I am trying to migrate my mailbox to Zoho, it all started well and now it won't finish / continue as the migration task is suspended due to:

User mailbox size exceeded limit.
Increase the mailbox size to resume migration.

I have since I got this message deleted large amount of emails as well as removed stuff from DOCS ...

The system is still getting me the message above. The mailbox size according the system says: 76% full..

Please, help!

Thank you.