First of all, you should firmly believe that you can grow into a great man. Forget about genetic factors and bone structure. You should set yourself a goal and then achieve it through hard training. Remember, if you doubt yourself, you will fail. Never set obstacles for yourself.
The second step is hard training, that is, carrying out the most basic weight-bearing exercises. Use barbells and dumbbells more, and use less combined equipment and pulley tensioners. Do more strength exercises to mobilize your whole body muscles.
3. Don't pay too much attention to muscle lines at this stage. You can break through the stagnation of some muscles by changing your movements. For example, the use of semi-squatting can increase the load, thus strengthening the stimulation of muscles and promoting muscle growth. Pay attention to peer protection during training.