hi!! for me and really every author i know, comments are the kind of thing that make our ENTIRE day. every comment (or anon message!) i've gotten about my works has gone into a screenshot folder on my phone and i do reread them often because they give me so much motivation to keep writing.
i know from the other side as well that a lot of people (myself included) can get intimidated/shy about leaving a comment, but i can promise you that literally anything you can say would have so much value to the author receiving it, whether its paragraphs of thoughts or one line you particularly liked or literally just a string of emojis. i've been writing in fandom spaces for, like, a decade-ish, and i've seen fics that were seemingly abandoned for years get updated just because someone left a comment to say they loved the story, just to give an example of how much it means.
thank you for asking (and welcome to reading fic!) 🤎