Hi
@Susie49. The four minor Guest Race farms/factories are needed less, as you get closer to the end of Chapter 23. But they are still necessary for the goods they produce, so that you can build more Heritage Huts.
I ended up with 11 of each type of Heritage Huts, making space by teleporting some of the minor Guest Race factories. The last few Research demands a lot of azurite, honey, dragon tooth, and flowers.
The iDavis quests may have more info for you:
https://idavis-elvenar.com/guestRaces/secretsofunicorn.html#quests