Herman miller aeron. they are outrageously expensive but totally worth it. You can get them used from resellers but honestly just get one new from the store. I got a used one and have no complaints other than I didnt get a brand new one to my specifications.
This is the only answer. All office chair purchases eventually converge towards an Aeron because it's the only thing that'll last a decade and fix your posture while doing it. I bought one just after the start of covid and is easily the least regret i've ever had spending almost a grand.