Trying to preserve the filibuster would be silly, because when the situation is reversed the GOP will undoubtedly bypass the filibuster whenever it suits their needs. True, they allowed the Ds to "filibuster" some measures in the recent Congress but those were measures the Rs only pretended to want! For example, the Rs were happy to lose their countless motions to repeal Obamacare: they knew an actual repeal would cause chaos. All they wanted was to score points with FoxPotatoes and other morons.
Mike Pence cast 13 tie-breaking votes to break 50-50 Senate ties while he was V.P.; that's more than any V.P. since Colfax under Pres. U.S. Grant. (Pence's 13 tie-breakings included some nominees too disgusting even for many Republicans, e.g. Brownback, DeVos, and Thomas Farr. Farr is the asshole who threatened North Carolina blacks with imprisonment if they voted; Trump and Pence made him a federal judge.)
During his 8 years as V.P., Joe Biden cast zero tie-breaking votes. Yes, that's Zero with a Z.
The composition of the U.S. Senate varied during the Obama and Trump Presidencies, but was often close to 50-50. Why then did Pence get to cast 13 tie-breakers, with Biden getting zero? There is no tie-breaking vote on cloture motions. Under Obama-Biden the Rs insisted on filibustering whenever they could, while using parliamentary tricks, I think, to prevent D filibuster attempts under Trump.