Defending Minas Tirith a strategic error?

[Nilpaurion Felagund]

why didn't Elrond and Galadriel have at least part of their forces engage in fairly suicidal local offensives to further distract Sauron? (Tuor of Gondolin)

They know they won't really be dead forever, but still no Elf wants to die. It must be that horrible stay in Mandos that they dread.

So suicidal attacks: out of the question.

Beside, Galadriel's Lórien is already busy.