Peripheral lesion in cere...

A 19-year-old male was brought in by a relative with a history of high-grade fever that began 15 days ago, which was responsive to antipyretics. The patient also experienced headaches over the same period, which were not associated with vomiting, blurring of vision, or projectile. However, over the past four days, the patient's sensorium has been altered. The patient had a history of pulmonary tuberculosis four years prior, which was treated with antitubercular therapy (AKT) and has no history of hemoptysis or loose stools. Vital signs are stable, and CNS examination revealed altered sensorium, with unequal reactivity in both pupils and power of 3/5 in both right and left upper and lower limbs. Deep reflexes were normal. MRI brain revealed multiple small peripheral lesions in both cerebral and cerebellar hemispheres with leptomeningeal enhancement. What is the further management?