If your video projects were created under one account (for example, a free account), but you purchased a premium plan using another account, you can transfer your projects by using the Team and Duplicate Project features.
The process works by putting both accounts into the same team, turning the projects into team projects, and then copying them to the target account.
Steps from your current account:
Log in to your current account.
Create a team.
Duplicate the video project to the team.
Invite the other account to join the team.
Steps from the other account:
Log in to the other account.
Accept the team invitation and join the team.
Duplicate the project from the team to this account.
Once completed, the project will be saved in the new account and can be edited and exported there.