Ignore both the users who love your product and the ones who are indifferent to it; the only feedback that raises product-market fit comes from the somewhat disappointed.

And the trick here is not to act too much on the feedback that the very disappointed people are giving you because they already love your product. Also, not to act at all really on the feedback that the not disappointed people are giving you because they're so far from loving your product that they are essentially a lost cause. but to focus on the segment of the somewhat disappointed people.