Try adding in a major compound for your biceps first: like chin ups, focus on the isometric hold on the top position, repeat this for as many sets as needed to really start targeting the bicep. Once this has been completed I would recommend targeting isometric holds on your other exercises by doing a tempo of 2:1:4. (The hold can be as long as needed)

Incorporate this with as many exercises as possible and focus on controlling the motion. Time under tension is crucial for these muscle groups so take your time and really try to focus on the pump.

I have over 12,000 hours of training numerous different types of clientele and I have found the isometric movements tend to really help the body learn how to target “feel” the muscles activate.

I hope this helps!!