The problem in NC might be atypical, though. State office pays $13,951 per year, and I’m not sure if that’s comparable to other states but it damn sure isn’t enough to entice anyone who isn’t already independently wealthy (and who can take 6 months off per year and not lose their job).
To be sure, the NC Democratic Party is utter dogshit at recruiting new talent, but they’re also fighting a seriously uphill battle in trying to find people who are willing to make literally below poverty level just to serve.
Literally all four of those options require legislation to move through the halls of Congress. Did you even read that source?