Hello,
If you are using Enterprise, then Odoo team will do the Migration, as it is part of Enterprises package.
But, You are using Community Edition, so probably you will have to do, And migration activity could be either Source Code Migration and/or DataBase Migration.
Either way you will have to undergo the migration process, in which first technical/code comparison needs to take, post that relevant actions needs to be taken, OpenUpgrade gives you a wonderful migration script, which does gives a clear comparison.
Once the Source Code is migrated, you can generally do Database Migration, again by following OpenUpgrade
For more Info please refer following link, may be this can help you :
https://github.com/OCA/OpenUpgrade/tree/13.0
https://upgrade.odoo.com/database/upload
https://doc.odoo.com/install/migration/migration