It's almost impossibly easy to find volunteer activities if you have kids, everything from daycare to school to field trips to soccer, they're almost always quite open to volunteer help.

See if you can look for (or create) opportunities for your kids to practice doing service, and support them. It's an important part of life, like exercise or intellectual growth.

Fortunately, coaching sports for children begins about age 6 in the US and continues through 16+... so there is plenty available.

Scouting (girls or boys, in spite of BSA's recent settlement) continues to add a lot of value to kids' lives, and ime attract many people with a strong moral compass.

Robotics - the FIRST program. Mechanical, EE, or SWE experiences can let you work with teenagers in a very impactful way. This would not require as much of a time commitment as a sport or scouting group.

Yeah, personaly I started volunteering when I realised I had a surfeit of free time. I ended with a nearby charity, tutoring high school kids from less privileged background; not necessarily the most fun activity, but at least I got to keep my basic mathematics fresh.

But seeing how much time kids take, I understand not being able to do that now; most of the people in the charity where I volunteer are retired.