A 32-year-old woman from Delhi presents on day 4 of fever with severe myalgia, arthralgia affecting wrists and ankles, and a maculopapular rash over trunk and extremities. She has mild thrombocytopenia (platelets 95,000/μL) and normal liver function. Serology shows IgM antibody positive for Chikungunya. She is haemodynamically stable with no bleeding manifestations. What is the most appropriate next step in management?