A good manager makes other people better. Full stop.
One who martyrs himself, saying “Look how hard I work,” “Look how much I know,” and “Look at the substandard talent I have to work with,” is likely ineffective because he cannot help the company or department adapt and grow. An organization will always surpass the capacity of its head doers.
Most managers are bad managers because most of us are too insecure to give away our secrets.
If you want momentum in your career, start managing now. Start making others better. Don't wait to be noticed, and certainly don't wait for the title.
To be clear, others will gladly, and often selfishly, benefit from your secret shortcut or knowhow. And when you get noticed...when you get invited to participate in the exciting projects...and definitely when you get promoted...they will take umbrage. Let them. They work for you now. If they don't, you have a marketable and highly sought-after skill. Move.
So, if you created a cheat sheet with weird Medicaid denial codes, share it with your co-workers. If you know a great Excel shortcut (or how to use pivot tables), teach it. If you think a peer is struggling, mentor them. It costs nothing and anyone can do it.
But here is the thing... not everyone will.