i know that it isnt just CF, its that im not that great.Falling for constant spot dodges isn't a CF approach problem. The problem is your overall gameplay. You would succumb to that tactic even with MK. You need to throw in A LOT more feints. You obviously never jab which is one of Falcon's best moves. A decent way to approach is a well spaced fast fall Uair to Jab/Grab (Mix it up to avoid shield grabs).
But like it has already been said. CF is also just a terrible character. The best option would be "Don't approach", but that is almost impossible with a character with 0 ranged attacks.
but its good to know how to counter it when its needed.