Never progress to New World.
Those 15,750 tiles are 22,500 there.
Would you have stayed in Atlantis, they would have been cheaper etc.
So it always depends on camp strength, region and food stock.
Why not leave the challenges until you have a stronger camp?
Yes, one wants all equipment. But if it‘s too expensive, why have a miserable time.
If you use the wiki maps, you can bee-line a bit in challenge 1, but still there are a lot of those big blocks.
Maybe only go for what you can get easily.