I'm a senior engineer now and I'm still learning to make myself ask questions; it's incredibly valuable at all stages of a career. As a junior dev, there's lots you just don't know; you need to ask questions so you can get unblocked all the time, and that's not a problem. And as a senior dev, you know enough to identify questions which don't have clear answers yet, and when you ask a question out loud and the answer is "we never thought of that", you just provided a ton of value in asking the question. And if, as a senior dev, you ask a question which does have a clear answer, if you had to ask then someone else probably had that question too.