Why the while loop is not working in this code?

I want to print the following pattern but the while loop for length is not running. When i run the code it only prints one triangle Below the code there is expected output and actual output :

height = int(input("Enter height ? "))
length = int(input("Enter length ? "))
spaces  = height-1
spaces2 = 0
while length > 0:
    for n in range(height):
        for i in range(spaces):
            print(' ',end="")
        print('/',end="")
        for j in range(spaces2):
            print(' ',end="")
        print('\\',end="")
        for i in range(spaces):
            print(' ', end="")
        print('')
        height-=1
        spaces-=1
        spaces2+=2
    length-=1

Expected Output :

height = 5 length = 3

    /\        /\        /\        
   /  \      /  \      /  \      
  /    \    /    \    /    \    
 /      \  /      \  /      \  
/        \/        \/        \




Output when the code ran :

height = 5
length = 3

    /\           
   /  \          
  /    \       
 /      \   
/        \