Not able to migrate the content at the site collection level

Hello I am not able to migrate the site content at the site collection level, i have copied the source site and then tried to paste it on the Target site collection and i have selected the all required options but the content is not migrating the tool is trying to upload the "Resolving and Migrating the Required Managed Metadata" And then some 100 Batches of Adding Taxonomy

Please advise here to resolve this issue.