At Worldcon 76, I was fortunate to be a speaker on a panel addressing imposter syndrome. The panel was excellently moderated and touched on a number of points that people with imposter syndrome can use to move forward. Some of the techniques discussed to help "make it to the end credits" included using writing as a cathartic release, viewing your insecurities as monsters that you can conquer, #buildaladder by adding rungs - no matter how small - to help you climb out of your darkness, learn to say "thank you" and to accept praise, or to reward yourself with something positive, like "cake".
E.M. Markoff is the award-winning Latinx author of stories about damaged heroes and imperfect villains. Her works include To Nurture & Kill and The Deadbringer, which Booklist described as "A fantastic action-adventure, tinged with Mexican folklore, that will appeal to fans of A Game of Thrones."