Basically that. It is difficult to truly know if one's novel is ready to publish, regardless of the publishing method, till they've had some feedback. I placed an excerpt from a novel I've written and edited more than once in the novel workshop area. https://www.writingforums.org/threads/tweak-or-the-universal-manual-of-time-travel-3600-words.129591/#post-1174913 It's had several views, but only one person responded. Although the critique was upbeat and constructive, the fellow was struggling with "insufficient data." I added some of the extra portions of the prologue, but now the 3600 word count in the title is no longer valid. On top of that, it seemed futile to add the supporting text. Upon discussing this with a mod, the need for a "beta reader" surfaced. Out of 40,000 members it would seem some might qualify as beta readers. The question about that is copyright protection, thus the trust involved. How does one go about finding these beta readers and, also seemingly appropriate, compensating them for the effort? Maybe consider shut-ins?