The original path you envisioned may have been blocked. Yet the goal still beckons, and it's still accessible, because somewhere, somehow, there's a more realistic, more effective way.
You haven't been knocked off track. You have been challenged to find that better way.
Stay committed to where you intend to go, while being open to all the many ways of getting there. Be flexible enough to keep moving forward no matter what.
If you are prevented from taking a big step right now, take a small step. If your original strategy doesn't work, be thankful you don't need to spend any more effort on it, and fashion a new strategy.
All the while, stay focused on the goal, on the destination. Identify yourself, your efforts, your energy, with that goal, rather than with any specific path.
The obstacle in your path does not have to block your progress. Decide instead to make it an opportunity, to learn, to improve, to adjust and continue forward, more effective than ever.