I definitely like Be independent, happy and strong, but I do pause at the word 'happy'. Happy is such an elusive state :) I'm trying to think of a substitute that suggests a contented state of existence without actually promising 'happy'. Maybe something like secure? I don't think that does it, so I'll keep thinking.

Live better with less is good, but it does strike a more economic tone. Second one has potential, but maybe there you can slip in happiness, rather than happy:
Make small changes for long-term happiness (peace, contentment, security?). I think that has good potential.

I don't know if that helps. Just where my gut takes me as I read the three choices. Definitely I don't like the first one so much because it does seem to focus on budgeting (money) rather than overall well-being.

I'm very happy to hear you are going forward with this. 🌟