You don't have to go public and become a full time activist, however, people who can afford to do real life activism or just informally talk to people about the Alt Right should be doing it. It isn't that hard to do. Test the waters with your friends. Start out with less controversial ideas, and move forward.
Remember, your experience isn't everyone's. Some people have friends who would be more accepting than your friends are. Also, people tend to be more accepting of different ideas than you expect. I used to think I would never be open about my views, but, now, anyone who knows me well is aware.
If our ideas were socially acceptable to talk about publicly, we would grow exponentially. That's why some are trying so hard to shut us down. They know that once you take away the taboo, we'll grow like wildfire. Every time one person goes public about their beliefs, it makes it easier for the next person to go public. That's why doxxing is a losing strategy for the left. Sure, it can harm the person getting doxxed if they can't afford it, but it's really a net benefit for the movement in the long term, because the more people are out there, the more the taboo goes away. I know that sounds really harsh, and I do sympathize with people who get doxxed.
I am not saying to dox yourself if you can't afford for your opinions to be out there, I'm just saying, do what you can afford to do. Test the waters with your friends. Start with less radical policies, like, "there should be some restrictions on immigration", and gradually move to "there should be a white ethnostate" over time.