Yea, though I walk through the valley of the shadow of death, I will fear no evil: for thou art with me; thy rod and thy staff they comfort me.
The picture behind "valley" is "something lifted up to work strength".
Has it ever occurred to you that the walls of the valley you are currently walking through are the creation of your own pride?
Proverbs 29:23 A man's pride will bring him low, But the humble in spirit will retain honor.
When we lift up ourselves in pride it reveals a strength that the world considers attractive.
But that strength has no comparison to the strength embodied in your unique God given purpose.
Learn the lessons of the valley, but do not allow it to be the death of your unique purpose.