[Alkhin]

Thranduil seems to have stayed content in northern Greenwood (Mirkwood, which was renamed after the War of the Ring). Celeborn's people would also have remained long content in East Lorien, the kingdom he founded in the southern part of the forest, in the lands formerly dominated by Dol Guldur (which Celeborn and Galadriel overthrew). Celeborn went to live in Rivendell with his grandsons Elladan and Elrohir before finally sailing over Sea, and the year of his departure was not recorded. So there may yet have been some Elves living in Rivendell, and in Mithlond, though some people feel Cirdan left with Elrond and Galadriel.

if this were true, why was it such a 'doom' for Arwen to stay? Surely these other elves had as much love for Middle Earth and humans as Arwen? Why did all of the 'doom' have to fall on Arwen's soldiers.

There is something seriously lacking in Tolkien's concepts of redemption and salvation that I have always found troubling. He doesn't even allow for Frodo to find complete release of the burden by saying Eressea was a 'resting place where he could heal' but not where he could find resolution and forgiveness. Tolkien's concepts of growth and life are very strange.

[Restorer]

There is something seriously lacking in Tolkien's concepts of redemption and salvation that I have always found troubling.

I suspect that's because the stories are set in a Christian world before Christ came. Without Christ there can be no true redemption or salvation, in Tolkien's view.