The Ordinary Niacimide serum did nothing for my skin?

I bought The ordinarys 10% nicinamide serum a while ago with the hopes of improving my skin texture and blemishes, but somehow it made it worse and my skin is really dry and irritated?

If anyone has or had the same problem as me, what am I doing wring? Should I use another product? Which products work for acne blemishes and texture?