Keep at it. But find a weight that is maybe 80% of your 68kg and begin there. Try to perform 10 reps for two or three sets. If you can do more than 10, increase the weight. Perform this workout for maybe 3-4 times. Then, increase the weight and perform three sets of eight. Increase again for five sets of five.
Also, make sure you build your lats so that you can maintain upper torso stability while lowering the weight on the bench. My best choice would be seated rows - right after your bench press. Then, end your workouts with close-grip bench presses, which can target your triceps. This is the muscle group that most often give out first when you perform the bench press.
this is what i got told and it helped me from 75kg to a 100kg,
hope this helps,
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