@vincentleo Add more bicep-centric exercises. Example, if you have a "pull day" where you're working back and biceps, do several exercises that work biceps. I see one day you do lat pulldowns. After your sets of those, assuming you're doing cable pull-downs, turn your hands so palms face you, do close grip pulldowns, hands about shoulder width. This works your bicep in a slightly different way (a simplified description. Then add different variations of curls, EZ bar curls, concentration curls, seated hammer curls, all to failure.
Similarly you should be doing multiple variations of tricep extensions on your "push" days. Palms up, palms down, overhead, skull crushers, etc.... hit em from different "angles". (Again, an over-simplified description).