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Think of this in terms of levels:
Maintain is to keep it at a certain level. For example, "To maintain my grades, I study every night."
Sustain is to strengthen or support, so a little more powerful than maintain. For example, "Planting trees, using less water, and turning off electronics when you don't use them, are ways to sustain the environment."
And retain is to keep, so unlike maintain, it's used as a sense of a fleeting thing. Like memory: "There's nothing he can do to retain his deteriorating memory."
So as levels of strength, you could picture sustaining at the top, maintaining at the middle and retaining at the bottom. Also, sustaining as positive, maintaining as neutral, and retaining as negative might also help. Hope this is helpful!