You can’t assume the obvious is obvious. Your experience and knowledge has value in a given situation. No one else has your unique perspective. That doesn’t mean that everything in your brain is worth communicating, but with a little discretion and thought, you should be able to bring value in most situations. And your piece of the puzzle may be the most important finisher.
You’re also not doing yourself any favors by not sharing your expertise. People don’t automatically recognize your skills, values, ambitions, and desires when you are quiet. If you wait around for people to notice or read your mind, you will likely end up on many paths that are not of your own choosing. You may end up with projects you don’t want, missing promotions you do, or accepting tasks you don’t have time or ability to complete.