“But over time, the executive branch grew exceedingly powerful. Two world wars emphasized the president’s commander in chief role and removed constraints on its power. By the second half of the 20th century, the republic was routinely fighting wars without its legislative branch, Congress, declaring war, as the Constitution required. With Congress often paralyzed by political conflict, presidents increasingly governed by edicts.”
Or, you know, you could just primary existing candidates. That’s always been an option. Take over the infrastructure from within is not as hard as you make it out to be with how it’s set up.
You cannot change the government without the will of the people on some level.