Maestral currently supports the syncing of multiple Dropbox accounts by running multiple instances. This needs to be configured from the command line by passing the --config-name option (or -c) to maestral gui or maestral start. This will create a new configuration file with the given name for Maestral. For example:
$ maestral gui --config-name="personal"
$ maestral gui --config-name="work"
This will start two instances of Maestral, syncing a private and a work account, respectively. All Maestral commands, apart from maestral about and the maestral config commands themselves, accept the --config-name option.
By default, the Dropbox folder names will contain the capitalised config-name in braces. In the above case, this will be "Dropbox (Personal)" and "Dropbox (Work)".
You can list all existing configurations with maestral configs and delete an existing configuration by unlinking the Dropbox account with maestral unlink --config-name="work". Note that your local files will not be deleted when unlinking an account.