This is an excellent question. For me, the most challenging aspect of writing is realizing when the story is not going in the direction I want/need it to, and making choices on how to proceed. It often results in a choice between doubling-down on a "meh" idea to get chapters out on time, or rethinking the narrative, getting feedback, and making necessary adjustments to fix whatever is broken. Having a third party or beta reader to bounce ideas off helps tremendously for that.