Reverse from ascending order to descending

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Lisp

I want to write a program which prints my list in descending order but what i could do it to do it in ascending order. So how do i now convert it to descending?

(define (in-order ls)
  (cond ((null? ls) ls)
        ((< (car ls) (cadr ls)) 
         (cons (car ls) (cons (in-order (cdr ls)) ())))
        ((>= (car ls) (cadr ls)) (car ls))
        (else "Nothing")))

What I have tried:

I tried doing in ascending order. I just need to convert it now