As said above, move the statewide elections to presidential years. Also, there should be a massive push toward merging municipalities. The state should then institute ranked choice voting for all elections. Having a semblance of a third party might keep the Dems on their toes so they don’t get lazy.
Why move the statewide elections to presidential or midterm years just to benefit Democrats? Democrats turned out in 1989, 1997 enough to almost defeat Whitman, in 2001, during the 9/11 doldrums, 2005 and 2017.