It seems like the root cause is that you've been working too much now that you've been promoted. Start pushing towards working less. Manage expectations. Lea

It seems like the root cause is that you've been working too much now that you've been promoted. Start pushing towards working less. Manage expectations. Leave work at work (and leave on time). You said it yourself, it was just for the MVP. You need to change the norm back to the way it was.