We have agency, especially people who give a thought to the world we live in. Most people tune in to TV, Netflix or the like. And yet we can do so much more.
I have that a try, not big earthshattering things, just a few things here and there, and then I looked for the results, like rings in water, staying anonymous where I could, pseudonymous otherwise.
And the interesting thing is that it doesn't take much to effect a change, make things better, improve life just a tiny bit. It takes more patience and persistence than hard work, something that surprised me a bit. And it still does. And yet it works. Of course there will be resistance and setbacks. Yet you can bear through. In a way it makes sense, for had it not, nobody could have built a civilisation. Kings and emperors are remembered, yet success was built on the backs of nameless people.
I know what you mean about growing old and not seeing success. People have written about it more poetically, like "Because their words had forked no lightning". So give it a try, and the next time you return, it will be a brighter place.