You can try to find a weight of 8- 12RM, which is 6,7rm. You can add movements, change equipment to practice, or use the super group, three or five movements with two heads and three heads, and there is no gap between the 3-5 groups. You can also strengthen the stimulation, and then practice more compound movements, bench press, squat and hard pull.
Without the sense of pump, the effect of muscle training is not so good.