I assume you have a variegated version of Senecio articulatus. No, don't repot - I agree, that pot is good for another 1 or 2 years. Water when the soil is dry. It needs full sun indoors. The only way to keep the variegation is full sun.
Only the green parts of the leaves photosynthesize so, it the plant gets less than full sun, it will start growing green leaves to support itself. No, it doesn't need fertilizer.
