During the Revolutionary War, the British switched to a southern strategy that ultimately failed. Why did the British move the fighting to the South?

There were several reasons why the British moved the fighting to the South in the Revolutionary War. One of the reasons was that British were not experiencing success in the North. The British had lost the Battle of Saratoga and had failed to cut the New England colonies off from the rest of the colonies.
Another reason for moving the fighting to the South is that the British had to defend all areas of the colonies. While the colonists did not have to win in all areas, the British had to be sure that they did not lose any of the thirteen colonies.
The British also moved the fighting to the South because more loyalists lived there. The British hoped they would get more support and a warmer welcome in the areas where many loyalists lived.
The British had some initial successes after moving the fighting to the South. They won battles at Charleston, Savannah, and Camden. However, the colonial strategy of using guerilla warfare techniques and avoiding large battles eventually wore down the British.
The British surrendered after the Battle of Yorktown.