What I have found as an author over the years when it comes to entering my book into contests and competitions is that even when I technically lose, I often win.
I win whenever the contest/competition includes detailed feedback, notes, a thorough critique or the likes on either my entire manuscript or at least the first few chapters.
Plus, typically when a judge is required to do that much work, they are a paid judge. This means they may be more invested in the entire judging process and how serious they take the work they are doing than a volunteer judge may be. Paid judges are usually also more accountable when it comes to judging the submissions than volunteer judges. Although more than likely experts in their prospective field, judges might tend to give their paid gigs higher priority and attention.
So, by all means, do your due diligence in vetting contests and competitions, as they sometimes have a submission fee attached to them. But outside of technically winning or placing in the contest/competition, determine if there are other benefits in submitting your work, such as feedback, critiques, etc.
A fine example is the Cinematic Book Writing Competition, of which you can learn more about by visiting https://screencraft.org/book.
In the meantime, to learn about dozens of contests and competitions (as well as other funding), be sure to invest in the "Make a Living as a Writer" course and/or course curriculum available at www.pathtopublishing.com/conferencestore.
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