The same old, same old is the same as becoming stagnant. Said differently: don’t be a stick in the mud! Try to do something new a couple times a year to take you out of your comfort zone. What it is depends on you.
Maybe it’s trying something new, like hiking or Pilates. Maybe it’s attending a class or conference on a subject that interests you but has nothing to do with your career, which will allow you to meet people outside of your usual circles. There’s an endless amount of possibilities, as long as it’s something you don’t normally do.
Stepping out of your comfort zone is a way to engage in self-discovery, keep life interesting, and expand your interests, horizons, contacts, etc. These are the type of actions that make you and your life significantly more interesting and valuable.