that will shift the position of equilibrium to

For the following reaction at equilibrium which gives a change that will shift the position of equilibrium to favor formation of more products?2NOBr(g) 2NO(g) Br2(g) ?Hºrxn= 30 kJ/molIncrease the total pressure by decreasing the volume.Add more NO.Remove Br2.Lower the temperature.Remove NOBr selectively.Could you please explain the theory ?