Honestly, I was just too busy this time. Also might have gone overboard in plan making these past turns, so wanted to just support someone else for a change. Didn't expect the discussion to just drop like that.
I can try giving some advice? Don't really have experience as a QM but I can talk about how this feels as a player?
I would guess this Quest fell into a weird limbo. It is a God quest but also has some fairly defined plot and progression, which is something I can't say I have seen before. Though I find this quite unique I can see how some players might get annoyed.
God quest players are usually super invested in discussion and making creative plans, so the mechanics can feel suffocating. I find having to work around the limitations of domain and potency quite interesting, but having to remake plans can be frustrating.
Most mechanics heavy quests have players that like to crunch the numbers and go for the optimal option. And the legend mechanics do provide a clear optimal path (to raise as many legends as possible every turn) but that clashes with the inherent creative nature of a God Quest.
Narrative heavy quests have players that mostly lurk or comment on the lore. Plan voting is not common on such quests, much less plan votes needing original and creative acts.
None of that is a mistake or bad, it just means this quest didn't fall in an already established niche with avid players. Or at least that's what I believe happened.
If you just want more casual voters, some pre-made plans with every update will probably help, make it easier for people to just vote and go. On the other hand, that will also make it more difficult for original plans to win, which might put off more invested players.
Anyway, I fairly like this quest, but if you feel the interest is not enought to keep going that's your right as a QM.