Try this as an exercise. Walk or cycle around your local neighbourhood. Make it your mission to only see and hear the good things you like however small. It may be a tree or a birdsong, a friendly smile between two passers by, someone in a brightly coloured outfit, a joyful child. Keep on seeing and hearing these good things so there is no room for negativity. Keep a mental list. You are starving depressive forces by flooding your mind with goodness. It’s an accumulative process.