Luck is when preparation meets opportunity.
God helps those who help themselves.
Any dream can be realized if you don't stop believing and working and researching towards it.
So first determine what is your dream, however out of reach or impossible or improbable it may appear to you now. Then begin thinking positively that there is possibility of you achieving it. However faint that hope is, that's ok. Then start taking small doable steps towards it, start following your heart and passion. Start researching on it. Even if this feels crazy, just do it because you enjoy engaging in researching more about your dream. Then due to daily following your heart and delving deeper towards your dreams, you will begin finding and discovering more and more things about that niche. Enjoy delving in it more, even though you are not seeing any immediate result, except the sheer joy of engaging in it. In time, due to paying so much focus and attention in one direction/topic/dream - 1) your subconscious mind actively works towards it, gives you new ideas, insights and ways 2) law of attraction comes in play as you build the momentum of your desire, so circumstances and events will begin manifesting so you can actually get closer to fulfilling your dreams.
And when intuition and insight shows you a way, follow it. Your faith and openness allows miracles and synchronicities to pour in. This way, by giving momentum first to your thoughts towards your dreams, and then in later stages even taking bold actions towards it, you will be met by right circumstances(due to the law of attraction) and your dream will be fulfilled. Thus, preparation is important, because luck is when preparation meets opportunity. Never stop believing in your dreams, and it will come to pass. The more days you keep on believing and researching in it, you will see that the improbable dream is gradually turning into actual possibility and reality for you.