@jameshelp Then i think i may be because of genetics ..
Have a full body profile check for vitamins and minerals , blood etc.
Take proper rest..
And just workout happily and do not think so much about your results..they will follow up eventually ..
@jameshelp Fellow people have already provided the info to you about what to take and which sets and splits to perform..
But my one opinion will be are you performing with the optimal mind muscle connection ..?
Are u enjoying & loving your workout ?