I agree to an extent but it's not impossible. I ended up collecting all the flames myself from the flames of fate voyages, I soloed the Fort of the Damned and I got it down to Graymarrow... and waited... a couple of new players who didn't really understand the event, or alliances, sank my ship (they were also in party chat so couldn't hear me!).
After sailing their ship away and retrieving my own, I came back to find a very helpful Galleon parked up with the newbie sloop. We managed to finally show the newbies how to join an alliance, I let one of the Galleon crew join my ship (to prevent a betrayal, it was the best option and they seemed chill anyway), and together we all completed the Fort, twice.
The newbie sloop, again apparently not really clued in, left the alliance after without any loot and just sailed off. At least they got their Alliance event goals done.
Moral of the story, just keep trying and you'll eventually get it. I've completed the event but when I see a FOTD, I sail by to see if there happens to be a ship with an offer alliance flag up, just in case they need help with getting it. You've got plenty of time, so don't lose hope. "You catch more flies with honey than vinegar", so just be cool with people and it might pay off.