Hi @UrBel
You can follow the steps in the documentation To Move the SSIS Database as it has some additional good precautions noted:
Follow the instructions for moving user databases. For more information, see Move User Databases. Ensure that you back up the master key for the SSISDB database and protect the backup file. For more information, see To Back up the SSIS Database.
You may also check the article step by step.
Moving the SSISDB Catalog on a new SQL Server instance
Also, here is a tool named SSIS Catalog Migration Wizard to that.
https://www.mssqltips.com/sqlservertip/6831/how-to-migrate-ssisdb-to-another-server/
Regards,
Zoe Hui