Judging by your quality you must be a new team. The truth is this game is unpredictable and no matter how much effort you put into tactics and formation it still won't matter much. You need to slowly raise the quality of your team by purchasing some players.
If it is hard for you to sign young 5 star players then go for older ones or young 4 star players higher than 75%, these players will grow faster with a little bit of training.
Before you worry about your tactics make sure to have some signings you won't go anywhere with 3 star players. Cheers