Ketu as the mokṣa-karaka is the giver of emancipation of every kind. Most astrologers only look at the spiritual aspect of freedom from rebirth, which truly is the penultimate goal. But there are many types of bondages and one seeks freedom from these or protection from it. Something like jail term for something wrong done or being trapped when you are not the one who committed the crime.
Either way, you need Gaṇeśa as the devatā of ‘Ketu’ for this freedom activation.