A locked door and a door you are afraid to open can look identical from where you’re standing.

From a distance, something you are afraid to try looks exactly like something impossible. Both produce the same result, which is that you do not go through. The difference only becomes visible when you approach and put your hand on it, which is the step fear reliably prevents.

Pick something you have categorized as closed and actually test it. Send the message, make the ask, apply. You will get a real answer instead of an assumption, and either one is better than standing there.