Find your intrinsic motivation
Making games is hard. It’s going to be time consuming and there are going to be difficult times. Of course there are many fun parts, but to be ready to make it all the way through, you have to be deeply motivated for the game you’re making. Why are you making this game? The answer to this is especially important if you’re a solo indie dev, making the game part of your life or even part of your identity/image.