You have your research and formal service within the department, faculty, and institution. You have your teaching obligations. These are all fine, but is it enough? What are you doing, what could you be doing to actually make the institution better? This is the bit about giving forward and contributing to the academic community in which you find yourself.
At the end of your career, what can you say about your time as an academic? What have you done to improve the lot of students beyond your own students and classes? What have you done to improve the fabric of the institution? Making it better for others? How did you choose to spend your time? Has everything been about pub counts and promotion criteria, or have you contributed to making the institution actually better? Will you be able to point to things and say 'I helped improve...'.
Over the years we have often heard 'just don't have the time' as an excuse for not doing anything beyond the minimum required. But, is this true? Not in all cases, but in many, tasks grow to fill the time and many of our tasks as academics are not efficient nor effective. There is lots of make busy time, questionable meetings, activities that give the appearance of work being done, but the return on investment is not that great. Have you ever wondered the ROI on a meeting where you have 6-8 highly paid individuals; how effective and efficient is the meeting, is the agenda worth having a meeting for? Do you actually know what an efficient and effective meeting feels like, how to run one? How to participate in one? In effective and efficient meetings, people come prepared, keep focus, sidebar things, and task activities. Meetings are not to actual problem solve in the weeds with 6-8 or more in attendance. Rarely is something done well in such a situation. So, before saying 'don't have time', are you being effective and efficient? Or, are you just doing busy work?
All of our academic activity can add up to a full day of things done, but did the things need to be done, time well spent, and we should be held accountable for a work day; 6.5 hours of work on average, value added work at that. If you do not feel like working on research, there is teaching or service. We are paid to deliver value, and as a professional, we should have some reasonable expectations of efficiency and effectiveness within the profession. And, if we are efficient and effective, there will be time to do things outside of the normal teaching, service, and research activities.