Thank you. I'm not sure why I was so riled up earlier but I've calmed down a bit. I think you're right about promoting. I hadn't received a bad rating in the year the book's been out before this one, so I think it's possible to turn it around. It's the name of the game, though. Everyone gets bad reviews sometimes!
As for the reviewer's comments, they highlighted some things on their Kindle so I can see them on Goodreads. For instance, at one point my character says something to the effect of someone he knows never having been secretive to him and the reviewer made a comment, "Everyone has secrets. How old are you again?" A few sentences later, the main character picked up on the secretiveness of the other character and the reviewer clocked that as an inconsistency.
Another one was that I had written something like, "'[Blah blah blah],' she said, taking a sip of her coffee," and the reviewer's comment was about how that was a simultaneous action and she'd be choking. I can see it, but I think a reader would know the character said something and then took a sip of her drink? I think the pettiness of it all bugged me the most, haha. But, either way, as I mentioned, I take it seriously, so I did go through and clarified things. There were some other comments about repetition, which I didn't view it as such but I removed some of it to be safe. That's the good part about self-publishing, I guess...I can always update things!
I really do want my work to be as professional as possible since I'm selling it. It's just such a struggle, though, when you don't really have a lot of ratings to balance out a single bad review.