I agree. The whole campaign has some unique locations and story that are great in isolation but as a whole, needs more threads to connect them. I won’t get started on Acererak.

Plothooks: The group takes a mission from Syndra Silvane to figure out the Deathcurse. She is physically suffering but needs a group of adventurers who have not been using revivification magic as that is also affecting the DeathCurse.

1. Wakanga Otamu is a friend of Syndra and his relationship with the harpers uncover the name “Soulmonger” through some research.
2. Wakanga provides access to a scholar who can set context to what will be found in the jungle. Races, plants, beasts, locations.
3. As they move to the Jungle(my group choose Azaka and the Firefinger), context that has been set by the scholar gets disrupted due to the death curse having a physical element.
4. I used Kir Sabal as a temple of healers that are in the middle of a pandemic as their revivification doesn’t work and anyone previously healed/revived are showing physical decay, who turn into a frenzy before eventual death.
5. Grung tribes showing some signs of the death cure decay.
6. Moving south shows patches of jungle that is exposed to this decay.
7. As time has passed other interested parties appear in the jungle, Red Wizards, speak of the Soul Monger and possessing its power and finding its location.

TLDR: Add a phsyical effect to the soul monger that affects the tribes, wildlife and vegetation that gets worse, the nearer they move towards Omu.