Troy Day Paul addressed slavery: “Each one should remain in the condition in which he was called. Were you a bondservant when called? Do not be concerned about it. (But if you can gain your freedom, avail yourself of the opportunity.)”
‭‭1 Corinthians‬ ‭7:20-21‬ ‭

“Bondservants, obey your earthly masters with fear and trembling, with a sincere heart, as you would Christ, not by the way of eye-service, as people-pleasers, but as bondservants of Christ, doing the will of God from the heart, rendering service with a good will as to the Lord and not to man, knowing that whatever good anyone does, this he will receive back from the Lord, whether he is a bondservant or is free. Masters, do the same to them, and stop your threatening, knowing that he who is both their Master and yours is in heaven, and that there is no partiality with him.”
‭‭Ephesians‬ ‭6:5-9‬ ‭

And the letter to Philemon.

Paul didn’t fight against slavery only said how to conduce yourself as a christian if you are a slave or a master.