Mechanically speaking from the perspective of Universal laws, you are always abundant. The universe always gives you abundance of what you are the vibration of. So it is not so much thinking I need to be abundant because you always are already so nothing will change. However the question you need to ask yourself is what am I abundant in? Abundant in lack? depression? anger? hate? self-worthlessness? Pinpoint the destructive abundance and simply rise it’s frequency to it’s constructive polar opposite.
You ask how? it comes down to your belief system. This is why meditation is so important. It helps you to be honest with your self and objectively evaluate your beliefs. Once you catch a belief that is generating a destructive behavior, you have the power to change it and re-write your own programming. So meditate and practice mindfulness really easy to start and keep these as a lifestyle. It will truly change your life to the better and place you as the captain of your ship.
So why do you start being unlucky when you’ve had an impressive streak of luck? It’s self-sabotage where the ego comes in and adds lower vibrations of greed or unworthiness of that much luck.
For luck specifically, I would play the Attract Good Luck and Fortune Audio along with Probability and Luck audio which has some self-sabotage prevention.
Good-Luck