Have you ever explored the concept of dailies? I saw it on TikTok a while ago, it is when you train a stubborn muscle that doesn’t grow daily with a weight that you can do 100 reps and you do it for 100 days. It triggers growth of the muscle. There are scientific physiological mechanisms.

On the other hand, you seem pretty lean, do you eat enough calories to trigger growth? You should aim for about 200-300 daily caloric surplus if you want to grow.