White elephant

I sometimes search English idiom to kill time. Internet is very convenient for learning English idiom and proverb.
Whenever I have nothing to do, I always do such a trivial. Well,a self-employed is likely to be out of work when he has no business.
So,I acquired many small arts .
A graduate from leading University hardly changes his type of job. If he changed his type of job, he would be "white elephant".
Unemployment become to be serious in U.S,and Japan.White elephants wonder what to do and are at a loss.
Description in WIKIPEDIA;
"U.S cruiser The U.S. Navy's Alaska-class cruisers were described as "white elephants" because the "tactical and strategic concepts that inspired them were completely outmoded" by the time they were commissioned – the Japanese heavy cruisers that they were designed to hunt down had already been destroyed."(by the way, this Japanese heavy cruiser class may be a Myoko-class that was the strongest cruiser in the world, but almost cruisers were sunken by U.S bomber)
After defeating enemy, we lose our job.
(I haven't known party game"white elephant". Employee and useless cruiser won't do like the game.)