The Divine Incarnation or the Authority—once activated, it's akin to an ultra-long-distance connection, which not only heavily drains his own energy but also impacts the already crumbling Greece world.
But avoiding trouble doesn't mean trouble won't seek him out.
The war between Warner and Asa gods, Orlog's eternal wager of law, the massive invasion of Fire Giant King Surtr, and the probing of the Norn Three Goddesses—after enduring these brutal battles, his Divine Power has been severely depleted.
Furthermore, he deliberately avoided forming overly tight fate bonds with the Nordic World to ensure he could extricate himself in time. As a result, he didn't actively develop or accumulate faith in the Fire God Loki in Nordic lands.
Under such circumstances, prolonged expenditure without replenishment inevitably led to a significant impact on his Divine Power.