Recently, I left a few comments on different posts, and received negative responses from other users. In the past, I have left the same kind of comment before, without any complications. So is there anything that I'm doing wrong, and what can I do to redeem myself?
You weren't specific about the negative feedback, though uhoh's given some possible examples. For myself, I like to periodically read the closed questions guidance and our code of conduct to remind myself what the site is about. I also try not to vote or make decisions unless I am quite sure they are consistent with the linked guidance and precedent for the site.
I don't think you have to redeem yourself as I believe our community doesn't hold grudges! I would suggest trying to use negative feedback to improve, if possible, without being so hard on yourself! I think you will continue to get positive feedback for thoughtful, helpful comments, especially on new users' posts.
Tomorrow will be another beautiful day on the stack exchange, so let's get out there and teach and learn some astronomy!