I have an idea for a few new categories where you try to get certain monuments like the park of fortune or the alter of peace. Although, this would exclude monuments like the empire's tomb, eye of god and the tower of wisdom because these categories already exist 100 stars, full map and full tech tree.

I think this is a really good idea! Would we end the timing on placing the monument or unlocking it?

I think it's a good idea to have a level category (or misc category if they are being transferred) for every quest in the game. To keep them consistent with the already existing level leaderboards, it would make most sense to end the timer when the quest is completed, and also that the quest itself doesn't have to be unlocked. For example the 100 stars speedrun does not require the Trade tech to be unlocked, so this should apply to all of them. Not even a need to unlock the monument itself.

I think that Gate of Power, Grand Bazar, and park of fortune would be great additions. Alter of peace would not be a good addition just because Ai-mo exists, who basically starts with alter of peace.