You have made the crossing to the Cape of Umbar from the Shield Isles and should now turn your attention toward reaching Umbar Baharbêl.
'This is not the road we expected to take to the City of the Corsairs, ${PLAYER}, but it is now the one we must walk. Let us ask someone in the nearby settlement how best to reach Umbar Baharbêl. The conclusion of King Elessar's mission awaits us there... but we cannot complete this quest until we reach the city.'
The settlement of Jax Phanâl is to the east.
The Haradrim that were pushed out of Jax Phanâl have a camp to the south where they keep the things they stole.
You recovered the stolen books and should bring them back to Jâkin in Jax Phanâl.
Nauriel has made the crossing from the Shield Isles to the Cape of Umbar, and you should speak with her outside Jax Phanâl.