Hey @darrenx
I’m so sorry for the late reply. Most times, if you want to bring up a specific lift, you just need to train that specific lift more often. If you’ve only been lifting for 5 years but your big 4 have been static for half that time, that shouldn’t be the case.
I really like the 5/3/1 program for beginner lifters, but I’ve found it more effective if you add in more reps to get extra volume. Most likely what you need is just to get in more reps of all the main lifts, then you could add in some accessory lifts to specifically help that lift:
ie.
back squat > pause back squat
Deadlift > deficit deadlift or deadlift w/pause on way up and down
bench press >paused bench press or weighted dips
overhead press>pin press or overhead barbell skull crushers
I would also recommend…doing a hypertrophy block instead of 5/3/1 where you are doing 12’s, 10’s, 8’s
Let me know if you have other questions