Advocacy can mean supporting something you believe needs to be changed or made better. Advocacy doesn’t always mean that laws or regulations need to be changed, but oftentimes that can lead to big results.
You are advocating when you tell those around you what you need. We all advocate for our individual children/family members on a day to day basis.
You may want to take it a step further and join with other parents and stakeholders to advocate for systems change. Many of the services now available are there because others before you took the time and effort to speak up or to help educate policy makers.