Feed the hungry. House the homeless. Give away money unconditionally to those in need. Build hospitals in poor countries. Fight disinformation on crucial topics (such as climate change). Provide disaster relief. Not build more power hungry technology that exacerbates our current problems.
Do literally anything positive for another person, that does not harm others.
The list is pretty big when one isn’t selfish; there’s no law forcing anyone to build space agencies.
A lack of imagination is not an excuse.