As long as you’re experiencing results with your current workout program, there’s no need to increase the number of workouts you’re doing per week.
An often neglected aspect of training is rest and recovery, which is when your body experiences the greatest changes. Doing weight training three times per week is adequate, especially if you continue to challenge yourself by progressively increasing the weights you use in each exercise.
We do not recommend adding more strength training workouts on top of what is already prescribed. Instead, you can add some solid high intensity interval workouts a couple times per week on non-strength days.
Be sure to get adequate rest, drink plenty of water, and stretch to prevent overtraining if you decide to increase your workout volume.