Kind over matter - am I really kind to myself and how can it make me more effective?

As I sit and reflect this morning after carrying out some metta meditation (which means loving kindness and is one of the most powerful forms of meditation for the brain.) One of the biggest things I have noticed is people not being kind to themselves, not just in mindfulness or meditation but it in life in general. Not taking the time they need to replenish their own energy before helping others, the time they need to be themselves