I've been working out for quite sometime now and what I've noticed is that my biceps compared to my other body parts take the longest to grow. Genetic-limitations aside, I'm looking for some helpful tips on how I can increase the size of my biceps.

I've been doing research on this and one thing I came across was to train the biceps 2-3 times weeks as opposed to once a week as I do with other body parts.

I primarily stick to compound exercise. Usually do drop 3 sets of 8 reps with drop sets to finish off.

Could this potentially be an issue with needing to put on more mass through diet to create size?

I guess I'm trying to find the root cause so any thoughts would be much appreciated so I can get past this block.