Make sure all subplots resolve, that all clues are present before the last quarter of the book. Using a Series grid may help to keep track of this and more.
A character with a voice means more than having them participate in some dialogue. Characters need to sound different from each other too.
Creating unique characters are vital if you want your readers to remember them outside of the covers of your book.
A snowflake can be drawn by adding the same small element over and over again and repeating the pattern until it has grown into a snowflake.
You have a list of themes or tags that you like—now what? Now it is time to transform them into a plot!
Get inspiration from themes you already like to get an idea, to keep going on your current project, or just for daydreaming.