Writing a business case can make a world of difference when it comes to prioritizing ideas you should work on.
At the very least, be sure you can answer to simple questions: What problem are you trying to solve? and What value would it bring if it were solved?
You may not know it yet, but by answering those two questions, you’ve already managed to prune your backlog from some useless ideas (not to mention you’ve encouraged your team to do some pre-thinking!)
Remember, you’re not just building ‘features’ - you’re adding value to your product.