Don't be afraid. Just stand where you are and watch the Lord Rescue you
The Israelites were in a classic rock and a hard place situation. On the one side was the red sea. deep and with no boats to get across; on the other side the Egyptian army which was (as far as I know) the most powerful army at that time in the Middle East. What were they going to do?
God tells them to sit tight and watch. I wander what it was like to see what those Israelites saw that day. The makers of the Prince of Egypt did it best with the fire raining down from heaven and the water rolling back like that. To see the miraculous power of God stepping in and changing the rules of nature on behalf of his people. it is just mind blowing.
This verse starts out by saying "Don't be afraid" God did not give us a spirit that makes us afraid. therefore when we are in a scary satiation we need to remember that there is no reason to be afraid, God will rescue us.
Sometimes we need to stand back and watch as god solves the problem. it may not be with fire and weather as when he saved Israel from the Egyptians but it will be in His own miraculous way.