One of the major union leaders in the US—I forget exactly who; it might've been the head of the Teamsters, but this was a while back, so I don't have the details—has, in fact, called for a general strike, as soon as it can be effectively organized.

That's 2028.

General strikes are not something you can just Make Happen. They're certainly not something you can reasonably scoff at an individual (one who's not the head of a major union) for not having Made Happen. They require significant amounts of coordination between unions if you want them to have a prayer of success, and that takes a lot of time.

Don't denigrate protests of the sign-waving type. They are a very important rallying activity for the resistance. Among other things, they help ensure that people who want to fight back know they're not alone, and ensure people who want the fascists to win know their feelings are not universal.