If I misread you why do you suggest that the Senate is not representative.
One third of the US Senate was elected before Donald Trump was elected. Many senators have been elected from the Democratic party since Trump's election. Making DC a state would not make the Senate more representative than it is.
Furthermore, the original purpose of the US Senate was to provide the State governments with clout in the national government. Today, the state governments have no voice in the national government because the voice which the Constitution gave to them has been taken from them.
The question of whether DC should be a state has nothing to do with Donald Trump. That question has been around for decades and it will still be around after Trump's presidency is ended.
Don't tell me that this is about being anti-Trump because this subject has nothing to do with Donald Trump.