To give Rs 5 SCOTUS seats, Ds 5 and another five who are selected from the Federal bench annually by the 10 to serve a year.
Would actually have to be 6-6-3 if Barrett is confirmed, but that would be acceptable.
It would re-establish the Court as a Judicial branch, not a second Legislative.
A grand myth about the "liberal court." The Warren court was, the Burger court was transitional and since Rehnquist it has been an ever more conservative body.
For Ds, though, the problem is that actually trying to do good governance in the face of a scorched earth opposition tends to always come back to bite them.