A 32-year-old woman from Mumbai with a 4-year history of SLE (ANA positive, anti-dsDNA positive, anti-Smith positive) on maintenance hydroxychloroquine and low-dose prednisolone presents with sudden-onset dyspnea, pleuritic chest pain, and a friction rub on auscultation. Chest X-ray shows a small left-sided pleural effusion. Pleural fluid analysis reveals: LE cells positive, ANA positive (1:320), low complement, and negative bacterial culture. Echocardiography shows a small pericardial effusion without tamponade physiology. Which of the following is the most appropriate next step?