So, I have been lifting for a few years but have a very weak bench (80 kg) while my weight is 85 kg at 6'1. I follow a bodybuilding routine 5 to 6 times a week, doing 8 to 12 reps until failure (A, B, C division), being:

A - Legs and shoulders B - Chest and triceps C - Back and biceps

Am I supposed to increase my bench press number naturally through this routine or do I need to implement a specific strength workout?

Thanks.