"meditations centered around compassion can enhance optimism."
"Researchers have also found that meditations centered around compassion can enhance optimism and positivity, heighten stress immunity, increased activation in brain regions associated with bonding, and reduce PTSD symptoms." so says Vishen Lakhiani in an article entitled "This is the No. 1 trait that keeps you "younger" and "more attractive" to others, say psychologists"
Ancient meditation practices like the “Loving Kindness” meditation and related compassion meditations are particularly beneficial. Compassion meditation strengthens the connection between the prefrontal cortex and the brain’s circuits for optimism, joy and happiness. The benefits are apparent right from the beginning of meditation practice and they increase with time spent.
Try these meditations: I find people enjoy this and often become quite emotional in a very positive way.