So you are unaware of the well-known speeches by Obama, Biden, Schumer, and most other Democrats favoring the filibuster? Please do the tiniest bit of research before making up provably false assertions. Democrats have never advocated eliminating the filibuster when they were in the minority.
I doubt you really do oppose the filibuster. If the Democrats lost the Senate in 2022 and the Republicans move to eliminate the filibuster, won't you be issuing a passionate defense of it?