Downvotes because people don't have an answer... or know the answer and don't like it.
What would Yandere Dev do without Yandere Simulator? Get a programming job? He's mentioned that he doesn't want to learn to code to industry standard. And a real job would be a lot more stressful, and have tangible consequences instead of just faceless people being too negative for his liking.
That's if he could get a job in the gaming industry with "Worked on a game for several years and never finished it. Never had a real job." on his resume.
His best shot would be to try to be a streamer, in hopes people would continue supporting his Patreon without Yandere Simulator, but he tends to get into conflict with his fans to the point I don't think he'd be very successful, or very happy, making a living off interacting with a chat. He'd be like DSP or Spoony... at best.
If you disagree, then post and tell me how you see it working out.