I totally agree with @lillycoyote. And it doesn’t really matter too much what the theme is, whether one of the big basic ones, such as
• man against man
• man against nature
• man’s inhumanity to man
etc.
and other relatively generic ones, such as
• the search for family
• quest for revenge
• love conquers all
or more specific ones like these:
• knowing a person’s secrets gives you power over them
• happiness is right in your own back yard
• you can’t keep a good man down
What makes a good story is not its theme but its characters, plot, and development. A strong theme gives it richness and depth, but a commonplace theme such as “love is stronger than hate” can underlie an immortal tale like Romeo and Juliet and no one will complain. You can also have a great theme, an ageless one that has animated some of the best-beloved stories of all time, and still write a flat, worthless ruin of a story.