The mistake far too many make with HCU is to look at their best pages and complain.
That’s not how HCU works.
HCU looks at your WORST pages, and if there are too many of them, slams the whole site for unreliable quality.
HCU tends to look harder at the pages that DO rank, and get traffic, but has other signs that maybe it shouldn’t, or a better result ought to be there. Remember, when Google do an update, it isn’t to spam-ban pages that already don’t rank.
It is always to either remove spam or low quality that does rank, or because better pages are not ranking where they should.