There is a commonly spoken saying when a door closes another one opens. True enough. If you are patient and wait for the new door that will eventually open, yes, something will inevitably present itself. Sometimes you just need to look around and the new door, may right in front of you. Often, however, while we wait, or suddenly it appears, there's an opportunity to make that door open, or take that step to open a new, unknown door. After all, the rest of the quote, not so commonly spoken says, "but we often look so long and so regretfully upon the closed door that we do not see the one which has opened for us." So don’t just wait for the other door to open, shove it open and make it happen. Chances are the door will give quite freely on of its own accord.
quote courtesy of Alexander Graham Bell