In Nazi Germany and its occupied regions, people who were not necessarily front line resistance fighters helped sabotage the fascist machine by producing shoddy goods, messing up production lines, disrupting the deportation bureaucracy, espionage, and much more.
This was all despite tens of thousands of Germans being executed for resistance activities such as these, and for much lesser actions such as distributing leaflets and doing graffiti (though it’s worth nothing that some peaceful protests were tolerated by the regime as a sort of release valve).
That was 80 years ago and infrastructure has changed. What types of sabotage might be most useful against a fully fascist USA regime?