The last time they had a meaningful majority they spent their time (72 working days) on ACA (a major healthcare reform), pulling us out of a recession, appointing two supreme court justices, and so much more. They are known as the most productive Congress since Lyndon B Johnson was president. The last official majority they had they spent their very thin majority cleaning up after Donald Trump and dealing with COVID.
Democrats don’t get strong majorities for long periods of time like Republicans do, and they are expected to fix every issue plus clean up after the newest national disaster that Republicans created. Maybe if we gave them time and a strong enough majority they would get more done.