Respect your work.
I’m a voice actor and had a repeat buyer. That’s awesome! I love repeat buyers. Problem was, he kept asking for 4,5, and 6 free revisions. I’m a people pleaser so I did them for free but this morning they stated on one of my recordings I missed a word. I listened to that exact one and, sure enough, I didn’t. I was incredibly frustrated, resent it to him, told him I recorded this previously mentioned word, and any additional revisions will require a new order.
I’m more than happy to help and bend over backwards to get my buyers the best product I can get them but I also learned that if you did your best, and know you didn’t make any mistakes without a doubt, then be confident with it.