The question:
"After California's ballot-harvest: What is to be done?"
The answer:
Short of outright federal intervention, there's not much that can or will be done.
California is now an entrenched one-party state and what's left of the Republican party there will never be able to summon up enough strength to stand up to the democrat-communists on this.
The dem-coms have supermajorities in both chambers of the Sacramento statehouse, right? They've literally become unstoppable insofar as pushing through whatever they want upon the state as if by fiat.
There's still the recourse of ballot initiative, but it's reaching the point that the electorate has tipped so far leftward that not even this method could be used to over-ride the legislature. And even if that was possible, the leftists would dig up some judge to overthrow the initiative as "unconstitutional" (a la Proposition 187).
Nope.
The only way California can be "forced back" towards normalcy is by direct intervention by the federal government, which probably means troops, etc.
Recall how federal actions/troops were used to force the Southern states to enroll blacks in schools, grant voting rights, etc.
Something like this would need to be done in California.
Failing that... the place is gone, insofar as the concept of "free and fair" elections are concerned. That will soon be but a memory there.