You want to try upgrading to Odoo 14.0?
Just do it.
Use the below command, on the machine where your database is hosted
python <(curl -s beta.upgrade.odoo.com/upgrade) test -d <your db name> -t 14.0 -c <your subscription code>
What does it do?
The above command will dump your database to a file, then send it to the upgrade platform for upgrade, displaying you the live logs, then restore the upgraded database back to your server, to a duplicate, test, database.
Everything automatically, as long as you have a regular, not complicated, setup.
The above is too technical? Don't worry, we will publish a regular, simple, website form to upload your database dump archive later this year.
Currently, this beta platform is an answer to our partners and technical users, who desperately want technical feedback (logs) during their database upgrade, hence the technical command line.