If there is a single most important element of how to become a footballer, it is the need to train harder than anyone else. This may seem obvious, but many people who want to become footballers think more about the glory than the hard work that is behind it. Even being able to do a lot of tricks with the ball is not as important as that constant training because there is more to footballing than tricks, and a lot of tricks are not that useful for game play.
Training hard means doing it regardless of how you are feeling that day. All soccer players have days when they are tired and don't feel like training, but if you want to know how to become a footballer, the answer is that you have to keep showing up consistently. The foundation of the great performances by your favorite players is this constant dedication to practice.
Training also means aerobic conditioning and strength training as well as training with the ball. Another aspect of how to become a footballer is working hard at technical skills. You must also be able to stay alert, focused and in motion for an entire game.
A competitive spirit is essential in how to become a footballer. You need to have great teamwork with your fellow team members, but you also need to want to be the very best. This competitiveness will give you the mental toughness needed when you feel your resolve lagging in games or during practice.