The encouragement of light against your being that enables you to respond with artistic generosity will save the world.
A change of heart can mean many things. I think it is the movement from resentment to gratitude. From “Why is this happening to me?” to “Why not?”
Lent is a practice. It is a practice preparing us for tests. Taking on a practice, giving up a pleasure for the season, fasting periodically, say one or two days a week, sunrise to sunset, engaging in a study or reflection that you may not normally do, exploring some inconvenient truth that needs attention, learning about the suffering of another, practicing compassion.
Then of course, failing at what you set out to do is part of the practice. Maybe you won’t fail. Then the test wasn’t challenging enough.