We can look back so much that we miss what is before us.  Take a look at the Israelites when they came out of bondage.   They let their flesh take control.  They started complaining and wanted to go back into bondage.  They were not thankful.

“Then the whole community of Israelites began complaining again. They complained to Moses and Aaron in the desert. They said, “It would have been better if the LORD had just killed us in the land of Egypt. At least there we had plenty to eat. We had all the food we needed. But now you have brought us out here into this desert to make us all die from hunger.” Exodus 16:2-3

Their hunger and thirst made them take their focus off the Lord.  What are you hungering and thirsting after, is it God?