I think a problem is that many jobs exist in the world, and we don’t even know that most of them exist or what they are. If there are any really large companies near you, see if you can get in doing something, anything. Once you are in, you can learn about the different types of jobs in the company and maybe start trying to work towards something that you like better, either within that company or in another company. Also just having co-workers or a boss to discuss these things with can be a big help and open you up to some new possibilities that you didn’t know about. But yeah, don’t worry about finding your perfect job right away. Having any job will open doors and connections, making it easier to land that perfect job in the future.
I don’t think anyone is going to change their views over an Internet post or conversation. Maybe someone might come around on a particular topic if an argument really resonates with them, but someone changing their entire worldview can take years. But sure, I think it’s possible given enough conversation and slight nudging over time, given they aren’t being more radicalized by other content every day.