He has already been, in a very particular order: a troubled student, a homeless teen, a viral video sensation, scorned by Black Lives Matter, swooned over by fans, signed to Warner Bros. Records, Instagrammed by Snoop Dogg, and predicted to be “huge” by New York magazine. On the eve of his major-label debut and a tour schedule that will see him sharing the bill with many of the biggest acts in the world, the Sacramento poet-rapper is working hard to stay grounded at a time when he’s so clearly taking flight.