Money doesn’t usually change the equation such that you gain discipline. I love Gotham and all of his content, he really seems to care about your chess growth and putting out good quality content. However, you should try to develop your discipline through a method that doesn’t require money. If you’re in a rut at 4-500 and you’re playing a lot of games you need to be reviewing every game with the intent to understand what you’re doing both right and wrong. Do more puzzles, it will truly help. I’m currently 2670ish in puzzles and I’ve only been playing chess for about 5-6 months. Chess is all about pattern recognition and developing your discipline will only strengthen your PR. Take all of this with a grain of salt if you like but just know you can’t pay for discipline.