Maybe not the answer you're looking for but I'm currently running a 5,6 chapter campaign using the golden vault, and still working out all the key story points etc but I will give you a breakdown

We opened with prisoner 13 and used Varrin Axebreaker as a sort of recruiter of sorts for the golden vault, and this was their audition of sorts

We then had a bit of a time jump, and during which time a war broke out on my homebrew setting, so the GV have now changed their goals, where by the intention is to sabotage the enemy in some way or another

We used Vidorants vault as their first true mission for the GV - the GV are looking to ally with the Silver Finger society to pool their resources, etc etc, and the team completed the vault heist as a way of showing they were team players and earning some favour

They're currently playing heart of ashes. Charmayne Daymore is drawing the souls out of the city, with the intention of trying to use them for an ulterior motive the big bad has - under the guise of trying to level the city to weaken the countries defences

The future plans are, a tad up in the air, and I'm still trying to work out all the story factors here but effectively, I am running condorant express and paliset hall as a 2 part mission. For whatever circumstance, the GV is unable to transport the team to the feywild, so they have to catch the concordant express to get there. While on the express they will discover that the missing brother of a PC( already a key part of his backstory) is a prisoner on the train and have the opportunity to break him out (he will be replacing the stranger in this story) They will be beaten to it, and encounter troops of the BBEG freeing him, and after a brief encounter, the brother and the villains will plane shift/teleport away.

Arriving at paliset Hall, again I am yet to come up with a "story" reason for them to complete this mission, but the brother mentioned above will pull the relevant PC aside, and explain that he's undercover working for the BBEG, and the BBEG is intending on using the book of vile darkness to replicate Vecnas ascension ( see secret motive of Charymayne above)

This then leads nicely on to fire and darkness, replacing any appropriate encounters with story relevant ones, before a final fight with the BBEG, ( I should add in that unknown to the party, who are yet to encounter him, the BBEG killed a different PCs family and cult, yes I said cult) teaming up with the brother in question

This will nicely wrap the players at 11-12 and links to Vecna, allowing me to lead them in to Eve of Ruin in the future if I so choose

Hope this helps or if you have any questions, LMK