You added the "just". Becoming a better person is probably the best thing you can shoot for, though obviously it's not a trivial process and requires significant effort and intention. I mean, what else can you do? You're the one that has to live with yourself.

Even if the whole world is going to shit, if you desire the happiness and wellbeing of others, as a deep internal orientation, this itself is its own form of happiness which is not subject to anything external. Since this thread already has Buddhist vibes, you don't have to take my word for it and can refer to metta (loving-kindness) as its own practice in addition to mindfulness.