Here "kingdom" refers to God's rule as king. Alternate translation: "May you rule over everyone and everything completely" (See: [[rc://en/ta/man/jit/figs-metonymy]])
This can be stated in active form. Alternate translation: "May everything on earth happen in accordance with your will, just as everything in heaven does" (See: [[rc://en/ta/man/jit/figs-activepassive]])