Attracting recognition to an author's works may not always come easily due to various circumstances. Though these books of exceptional quality deserve it, their books often face hurdles such as inadequate marketing or limited distribution compared to more mainstream titles. Breaking into "The big four" publishers can be especially daunting and requires connections or luck for success - in my estimation there remain undiscovered literary gems out there waiting for their time in the limelight - like hidden Stephen Kings awaiting recognition and praise. Voila! Best wishes Guy
I realize that I am not answering the specific question you asked, but I have an interesting take on your question. I am focused on the difference between “underrated” and “underread.” Readers tend to follow the frontrunners regardless of quality, ratings, or reviews. Traditionally published authors build huge followings, sometimes without doing quality work. I would encourage readers to check out some self-published authors. Read their reviews. Are they overwhelmingly positive? Have their books won literary awards? These authors are not underrated, but they may be underread. Does the subject matter interest you? As Robert Frost once said, following the road less traveled might result in you finding a new author and a highly enjoyable reading experience.