What does 1 Chronicles 27:33 mean?

God chose me from my whole family to be king over Israel forever. He picked Judah as the leading tribe, then my father’s family from Judah, and then me from my father’s sons. He wanted me to be king over all Israel. 1 Chronicles 27:33 - Modern Text Bible

(David reflects on how God chose him, step by step, from the tribe of Judah, then from his family, and finally as king over all Israel.)