Fractured tooth 11: treatment approach?

Hello colleagues. This is a patient, an 11-year-old boy, who fractured tooth 11 (European classification) while playing . The child visited the office 7 days after the incident. Tooth 11 is still vital, but with an open pulp chamber and reduced vitality. The tooth has a 2nd degree of mobility. In addition to the large fracture of the crown, there is a second oblique fracture on the palatal side, which reaches the bony edge. Please guide me for the right approach to treatment!