Most tech jobs today are highly commercial and not about making life better. Even if you manage to find something that is somewhat relevant to the real world, like green energy research, chances are it might be something highly technical, abstract, and difficult to relate back to the final product.
For everything else, you'll likely just work on the arms race to the bottom -- whether it be an arms race to fight for attention in the narcisstic space of social media, improving database read times at Google, making some new AI to replace millions of humans, wasting people's time with more advertising, or making poor people buy more stuff they don't need.
In my opinion, if you want to have something truly fulfilling, you'll have to first ask yourself how you can actually make the world better, and then strike out on your own to do it. 95% of modern tech jobs are just a weight on society's back, dragging us down.