The number 1 fault we see when teaching is when people slip line into their false casts, lengthening line each time until they have too much line in the air to handle. They think that by increasing the amount of line in the air before you make the final cast, you will get further. This is rarely the case.
The real solution is to have the optimal amount of overhang before you make the final cast.
To start, try using the overhang marker just out of the rod tip, if the cast doesn't work, bring some line in and bring the overhang marker to your hand. Keep trying different positions of the overhang marker until the cast works.