My Advice is, maybe you should try to find out the centralized exchange the address traded bitcoins on, maybe the owner of the address have KYCed on that exchange, so they are the ones in the best place to provide you with the information you seek, but mind you, you must give them the reason why you want the information of that user, and your reason must be of utmost importance and highly genuine enough, if not, you won't be given any attention.
No matter how good the reason is, there's a very good chance they'll give out such info only under a warrant.
However, if the address is not posted in a forum or part of exchange, a good direction can be to look at chain analysis websites and see if it's linked to an address that can be tracked. But such info is most probably also not for free (that's why I will not do the research; I hope it's a helpful idea though).
PS. I tried to help; if you feel like removing the post, feel free.