If you are willing to spend the time, effort and money for a freelancer, definitely lookup upwork.com or freelancer.com
Alternatively, do a quick search on FB groups.
If you need work on a consistent basis, hire those agencies that offer 'unlimited copywriting' on a monthly basis. They can usually churn out 3-5 articles a month. Scribly is the first that comes to my mind but you can do a quick Google on 'unlimited copywriting'