First of all, to avoid further confusion, please make sure to rebuild .aab:
You uploaded new app bundle to update my publication and got the message The API target level for your application is 28(it might be 29 as well). To ensure the necessary performance and security, the API target level must be at least 30. Change the API target level for the application so that it is at least 30.
It means that the template that your app based on is deprecated, we suggest you create new app using the relevant template.
There are two exceptions at the moment - Photo Editor and Media Player templates are on maintenance, they will be up and running soon, please subscribe to our newsletter or Telegram channel for updates.