Frustrating endgame

[Metathron]

I seem to be stuck in the game. I have several active quests, but no idea how to complete them. I'll stick to the main quests:

1. Alliance with the vikings. What remains to be done is:
- Talk to the caretaker of the mine
- Forge an alliance with the vikings

Who/Where is this caretaker?

2. An Alliance with the Elves

No idea where to find Amelie. Perhaps she's on one of the last two islands, which I have not yet uncovered. Probably one of the unfinished quests will open the way?

3. An Alliance with the Dwarves
- Negotiate a peace treaty between King Korn Digor and King Asvald
- Forge an alliance with the dwarves

Talking to either of these provides no (further) options. What else is there?

My unfinished secondary quests are Rod Rotmouth, Plundered Stylist, Heir to the Throne, The Sorcerer's Pet Frog, Paper for the Professor, In Search of Lost Treasure, Pirate Treasure, Special Offer, A True Pirate, Ay Vaz's masterpiece, Attracting Customers, Beast Hunting, Jacket for the Whaler.

Any hints are greatly appreciated!