I'm familiar with the depressing statistic already, a little under 10%.
However, bear in mind that the majority of the most critical infrastructure for making profit, such as ports, trains, trucking, and medical care have the highest rates of unionized jobs, and would still be incredibly effective for a general strike (Generally only 3.5% of the population would need to participate to have a meaningful effect). Even with our abyssal rate of unionization, we still hold incredible leverage if we choose to use it.
The UAW has a general strike planned for May 1st 2028, which has real odds of working. Unfortunately it's still 2 years out, and by that time may be too late. I'm hoping it's moved up at some point.
That's why mutual aid organizations are essential. They operate outside of the legal system, so can't be directly targeted as easily. If you or anyone else reading this have the time, please consider joining your local mutual aid group. That could be Food Not Bombs, a different group local to your city or town, or even your local church if you're in a rural area.
If you don't have one in your area, start one! Here's a little guide on how and where to find likeminded folk to start one with: https://infosec.exchange/@tinker/113589807117870451