A 28-year-old woman from Delhi presents with a 6-month history of arthralgia, photosensitive malar rash, and oral ulcers. Laboratory investigations show ANA 1:640 (homogeneous pattern), anti-dsDNA antibodies positive, low C3 and C4 levels, and urinalysis reveals 2+ proteinuria with RBC casts. What is the most appropriate next step in management?

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