The filibuster is a anti democratic tactic used for many decades to prevent progress.
For a long time, the requirement was 67 Senators, two thirds of the Senate, to overcome a filibuster.
Lyndon Johnson was famous for fighting the filibuster, and overcoming the barrier in 1964 to pass the landmark Civil Rights Act of that year.
In 1975, the barrier of the filibuster was lowered to 60 Senators to end debate, and allow for a vote on legislation and appointments.
With the Republican Party refusing to cooperate at all on the COVID 19 Pandemic legislation, after almost all House and Senate members of both parties did so twice in 2020, it is time to move, at least, to lower the threshold from 60 to 55 Senators, in order to be able to make progress.