Well, you start taking a larger risk because you want to make money fast. You're unwilling to cut your losses because you don't want to lose. You have such immense pressure on yourself and things eventually spiral out of control. Eventually, you blew up your trading account and you're still in debt.
There can be many reasons why you are not profitable. It could be discipline issues, psychological factors hurting your trading, or simply having no edge in the markets. Without a trading plan, you will never know what is the cause. But when you have a trading plan you follow religiously, there will only be 2 outcomes.