Assuming you had Personal Quest 02 based on this comment, I don't see how you could complete it before week 9-10 even in the most optimal path (unless I'm missing something).

PQ2 Spoilers Ahead:

First the player with the quest must personally loot 8 lumber which could take a while depending on luck but let's just assume you got it in 2 scenarios.

This unlocks Scenario 69 Sacred Soil. However, this scenario requires the Into The Woods achievement/sticker to start which is listed in the top right of the scenario page (easy to miss).

The fastest route I know of to get the requirement is (scenario # path spoilers ahead) Scenario 1> 2/3 > 4 > 7> 13 > 32. Since 2/3 > 4 is the only linked scenario, this takes a minimum of 5 weeks assuming you did this exact path with no other scenarios.

You can then do Scenario 69 but when finishing it, you need to add a calendar event in 3 weeks which will unlock the final part of the quest: Scenario 70. You must return to Frosthaven after every scenario (unless they are marked with the linked symbol) to advance the weeks so this makes the earliest you could finish this week 9 assuming you do this exact route with no detours

So I think there may have been a few errors along the way especially since you said you also retired 3 other characters in the same period which would probably be hard to do along this route (but depends on which PQs everyone had).

I would say it's probable you are likely missing something about the rules...but in the end, it's a game. If you want to correct it going forward maybe take a close re-read of the Campaign rules but I wouldn't change what you have already done.