Cast all your anxieties on him, because he cares for you. Peter calls not for a pious exercise but describes a relational reality. You may hand off worries because someone is there who carries them.
Sonship means: you have a Father who cares. Not abstractly but really. He cares for you, not once you are perfect but now.
Today: cast your anxiety on him. Not as technique but as the trust act of a child.