It all depends. We can help, but you need to provide more information.

1) What exactly are you looking for him/her to write on?
2) How much are you looking to spend?

js

There are many good copywriters who frequent this forum. Check
out the posts here in the copywriting area and read the sig-lines
at the bottoms of the posts. Those will direct you to websites
where copywriters tell what they specialize in, so you can choose
a writer appropriate to your needs.