Here "kingdom" refers to God's rule as king. AT: "concern yourselves with serving God, who is your king, and doing what is right" (See: [[rc://en/ta/man/translate/figs-metonymy]])
This can be stated in active form. AT: "God will provide all these things for you" (See: [[rc://en/ta/man/translate/figs-activepassive]])
# Therefore
"Because of all this"
# tomorrow will be anxious for itself
Jesus is describing "tomorrow" as if it is a person who can worry. Jesus means that a person will have enough to worry about when the next day comes. (See: [[rc://en/ta/man/translate/figs-personification]])