DC statehood cannot be granted by ordinary legislation but would require a constitutional amendment.
The Enclave clause gives Congress exclusive jurisdiction over the federal district, by design. The Founders did not want the national capital sitting under the political control of any single state, getting caught up in temporal politics, but rather wanted it to be a sort of eternal city.
The 23rd Amendment was A compromise, granting the district three electoral votes, the same as the smallest state. But again, desiring it to be above state politics and an “eternal” city, those electors are appointed “in such manner as the Congress may direct.” There is no constitutional right for DC residents to choose them by popular vote.
If something like this is done, it would cause mass chaos. BC a future Congress, by concurrent resolution and without a presidential signature, could appoint the three electors directly rather than allow a local election. A Republican Congress could install Republican electors for DC, even over the objections of a Democratic president and an overwhelmingly Democratic DC electorate. Congressional supremacy over the district stays intact, and the 23rd Amendment’s limited representation is honored on its own terms.
And basically.. none of this it thought through. It’s just raging against the machine. Good luck.
If Democrats actually want to fight back after the VRA ruling, they should split DC into 8 wards and admit them as states. 16 Senators to codify voting rights reform into the Constitution. No more half-measures.