Social utility is not easy to define. The main problem is that it's impossible to speak for all timescales at once. Particularly when you take some sort of norm on all the individual utilities. This sounds overly technical, but I have a point.
Don't work towards maximizing the utility of everyone, it's nonsense. People aren't that cooperative, even. Work towards bounding the minimum utility. There's lots of social and physical extinction events that humanity faces. Even if you have nothing directly to contribute to these problems, perhaps you can realistically contribute to the welfare of other people who are contributing to these problems.
Don't work towards maximizing the utility of everyone, it's nonsense. People aren't that cooperative, even. Work towards bounding the minimum utility. There's lots of social and physical extinction events that humanity faces. Even if you have nothing directly to contribute to these problems, perhaps you can realistically contribute to the welfare of other people who are contributing to these problems.