GuardianLurker
Adventurer
Lost City - 23 - 2 = 21
Desert of Desolation - 25 + 1 = 26
Isle of Dread - 21
Castle Amber - 26
Desert of Desolation - 25 + 1 = 26
Isle of Dread - 21
Castle Amber - 26
Castle Amber is set in a none D&D world.
https://en.m.wikipedia.org/wiki/Castle_Amber_(module)
Averoigne is from Clark Ashton Smith stories, not a D&D world.
I know where it's from, but that doesn't make it a "non-D&D world". There is no rule that a adventure must be set in an official world, and can't be set in a world from a book.
And in this case, the story follows the familiar trope of lifting the players from the world they are in, and transporting them to a different world (with the likely motivation of trying to get back home). So the start can be set in whatever world your players are currently in.
Desert of Desolation was originally a "generic" adventure, and not set in any particular D&D world.
I suppose you could adjust Castle Amber to place in a Ravenloft Domain.