It's highly complicated to advise you with these scarce details. The success, or failure, of rooting depends of factors as the species, the rooting methods, the hormones and concentrations, conditions of your lab (photoperiod used, light intensity, temperature....), the protocol....
Auxins such as IAA, IBA, NAA promotes rooting (0.5 - 2.0 mg/L), Strength of medium affects rooting and full, half and quarter can be tried for optimization (It depends on plant species).