The BLS Occupational Employment and Wage Statistics survey covers wage and salary workers only; it does not include the self-employed. For writers and authors that is a big gap: the BLS Occupational Outlook Handbook lists 65% of them as self-employed. The figures on this page describe copywriters on an agency, brand or publisher payroll.
Freelance copywriters set rates by project, word or hour, and there is no BLS figure for that income. If you compare a freelance rate with the staff numbers here, remember that a freelancer pays for their own health insurance, equipment, unbilled time and both halves of Social Security and Medicare tax.
The second thing to know is the outlook. BLS projects little or no change in writer employment through 2035 and names AI writing tools as the main reason. It also says writers will still be needed for online media and advertising.