The Senate is "supposed" to be a deliberative body in which legislation is debated from both sides' position. If it comes to reforming the filibuster instead of getting rid of it, perhaps some Democratic senators hesitant to diminish the filibuster in any way would like Adam Jentleson's idea in his 2021 book about the filibuster, Kill Switch: The Rise of the Modern Senate and the Crippling of American Democracy. In the book, Jentleson suggests that the minority should be given a chance to persuade the senate majority of the minority's position. After say, an automatic five days of minority persuasive speeches, an up or down majority vote would be taken on whether or not to move the bill to a full Senate majority vote:
The rules governing debate should go out of their way to make sure the minority is afforded ample opportunity to make their case. Senate rules could establish a minimum period of debate (for example, five calendar days) during which the minority can have its say on the issue with no threat of being overrun by the majority. After the five days are up, a cloture vote will automatically occur, at a majority threshold. If the vote fails, debate continues; if the vote succeeds, debate is brought to an end and the Senate proceeds to vote on final passage of the bill.
This might please Senator Manchin because the minority, in this case, the Republicans, would get ample time to take the Senate floor and try to persuade the majority, now the Democrats. If the minority doesn't have any or only a few days of presenting its side, then the minority debate would be stopped and an up or down vote would be taken.