Tooth with fracture 4mm apical to alveolar crest on sublingual surface, vital, caries exposure. Most appropriate treatment?

Subcrestal fracture/caries margin with adequate root support: CROWN LENGTHENING (osseous surgery to expose margin and reestablish biologic width) + RCT if needed + core buildup + crown. Extraction not required if adequate root support exists and ferrule can be established after crown lengthening.