Give your brain a workout by learning to play an instrument. According to the linked article learning to play an instrument improves attention to detail, enables better memory, and aids the building of strategic skills, amongst other benefits.
Many of my clients (both young and old) wish to expand their lives and find ways of meeting other people, beyond the circle of work colleagues; they are also often overworked and stressed. These clients sprang to mind when I read this article. This could be another excellent solution for social isolation, stress and overwork; learning to play an instrument not only allows one to set aside some time just for oneself, it’s also an absorbing form of relaxation and can opensup a host of possibilities for socialising and expanding one’s horizons.