Democrats control the presidency and have majorities in the House and Senate. They could expand/rotate the SCOTUS or at least guarantee abortion rights as a matter of federal law. The SCOTUS is only as powerful as the other branches allow it to be through inaction.
Right, it's a clear sign that huge corporations and billionaires control the entire DC political system that Dems don't do anything to protect democracy or help anyone who isn't rich even when they control both the Executive and the Legislative branches of government.