That’s incorrect. There’s a lot of obstruction from Republicans to allow Democrats to do anything since most decisions required 2/3rds vote to pass. Democrats could not convict Trump of impeachment with 57% of the vote since they needed more Republicans to push it over 2/3rds.
I don’t think you understand American politics. If Democrats control 60% of the Senate, they still do not have the majority needed to pass laws. They need to control at least 67% of the Senate to pass laws. Otherwise Republicans can block their vote. That’s why the Democrats could not convict Trump on impeachment even though they controlled more than 50% of the Senate at the time.