As a copywriter, yoh should know that you are valueless as most companies will depend on you to write their ads scripts for their marketing strategies. That's why it is always better for the freelancers to know what to do in order to know the right clients to work for. You can do a background check up to know the one that will actually pay you the task you want to do. You can check, from your researches the one that aligns with your goals.