A 32-year-old man with a history of intravenous drug use presents with fever, malaise, and a new regurgitant murmur. Blood cultures are pending. Echocardiography shows a 1.2 cm vegetation on the tricuspid valve with moderate tricuspid regurgitation. He is haemodynamically stable with no signs of heart failure or septic emboli. What is the most appropriate next step in management?