Your Zoho CRM migration is paused because of the exceedence of API limit. In accordance to your Zoho edition, you have restricted number of API requests per day and organization. That is why Data2CRM puts on hold your Zoho CRM data migration till the API requests will be updated. When number of API requests is restocked, Data2CRM automatedly will carry on the migration process at once.
To find out your Zoho API request usage visit this page.