Gawain (one of Arthur's own chief advisors) and Edern ap Nudd (still representing the interconnected Underworld) attend Geraint, alongside a group of experienced chieftains or their heirs. Together they ensure that Geraint is accepted by his people, knows his territory and faces no immediate challenge to his leadership, then they depart.
All fired up, Geraint enthusiastically consolidates his position as ruler, then seems to get bored. Significantly, we're told that he gives up on holding tournaments, because there's no-one there who can provide a decent challenge.
He's patently still hankering for his old life back with Arthur.
Geraint takes to hanging around with Enid, while neglecting his duties to his people. In short, his resentment at having to come home is such, that he considers his mere presence to constitute leadership. He does love his land, hence staying put, but as something abstract. It's not a soul connection worthy of his passion nor even his active participation.
It's his father, the old ruler, who still truly cares about their territory and tribe. He's attentive enough to see the vulnerabilities opening up, and he turns to Enid - the Goddess of Sovereignty - for help. Her distress signals that a power struggle could usurp Geraint as reluctant ruler.
We're told that Geraint misunderstood Enid's cry to mean that she'd already been unfaithful, i.e. that she'd already switched her divine support in favor of another claimant. But his interpretation wasn't too wide of the mark.
Enid had pretty much just given him notice that his indifference had to end. He had to learn to love Dumnonia body AND soul, accepting her favor not in arrogance as his right, but as something to be cherished for its own sake. He had to live and breathe the place. The Dumnonii had to mean more to him than Arthur's people.
The Goddess of Sovereignty would always choose the strongest and the best candidate to favor as chieftain. Geraint was that, hence she supported him still. But from now on, it wasn't enough to merely rule. His connection to the land had to be absolute.
Geraint understood. If he didn't fight hard for something that he didn't particularly want, then he would lose it. What followed was the reluctant ruler on a spiritual journey of discovery to find out if he cared.