Whatever fits into your wheelhouse but volunteer.
Whether you’re a marketer giving your time to a small ad agency.
Or a coder giving your time to a non-profit.
Or an engineer coaching a youth basketball team.
Or a (INSERT PROFESSION HERE) doing (SOMETHING GREAT HERE).
You might go in thinking you’re going to get nothing out of it – but you will, it simply depends on what you are willing to put into it that will be the differentiator.