Question about purpose

Hi coaches, I know that I’m indulging in some confusion here but I’d really value your input. The purpose I defined in 2017 was ‘to be a force for good in the world’. It resonates with me but it’s so broad that I find it doesn’t provide too much direction. I’m thinking about making it more specific and changing it to “I want to raise the level of mental health in the world” – but is this putting other people in my R line? I believe in it but when I try it on it feels overwhelming. I’m seeking a purpose that feels true and inspiring.