These accounts are showing up in people's replies and superficially look very much like either a fellow writer interested in your work (but they clearly know nothing about you specifically) or a reader/fan who wants to "introduce" their "book club" to your work - and seems to think they need your input to do that, but also doesn't seem to know anything about your book, or maybe knows the title of a recent publication but not much else. Don't engage. I'm nearly certain these are LLM agents.