All good points raised. I think one review is a good idea, but the review can be edited. 3-5 reviews can still be used to inflate or bomb novels as malicious people can still create fake accounts.
Also, for not being able to review, rather than limit by level, how about actually reading the story first instead of a bunch of chapter 0 or even 1 reviews? I’d say even minimum of 5 chapters because reviewing on a few chapters really tells nothing significant or insightful. This is a story review after all, not a chapter, oneshot or short story review.