Not Taking Care of Yourself
It’s easy to make big mistakes if you are exhausted or drunk. That’s why you should make an effort to get enough sleep and stay away from alcohol. In fact, anything you do that’s bad for your ability to make prudent decisions. Making bad decisions is how you lose money betting. A healthy mind resides in a healthy body. If you are overweight and under-conditioned, lose some weight and start exercising. Eat more fruits and vegetables, and take multivitamin.
Stop eating so much junk food. These all seem like they are only tangentially related to your betting experience, and maybe that’s so. But just because the relationship is only tangential doesn’t mean it’s not important. The more effort you put into keeping yourself healthy and capable of good decision-making, the more likely you are to succeed betting.