advice/feedback for someone below average and just starting out

Hi, i'm three days into my routine which is shopping bag hanging with 5lb weight in a backpack (spending 30 minutes everyday by doing 10 min sets with 5 min breaks in between) in the morning after I shower, as well as doing u/ Financial-Staff-4941's manual stretch routine in my free time when I'm watching youtube videos and stuff. I am kinda hinging on this working because if I am measuring my dick correctly, I think I only measure up to 4.7 cm bone pressed, which I'm not sure about because the skin around the base kinda pulls taut when I'm erect and pressing down hard in the middle of my shaft hurts like hell and my penis also curves upwards, but there seems to be more shaft falling around the sides by my leg IDK. But either way, it's probably only visibly 4.5. Even just reaching 5 inches would help my confidence so much

Do you guys have any suggestions on what I should add to my routine? Is this good? Are there any ways to be more efficient? How long do you think it'll take before I see any gains, because I see people talking about newbie gains and the sort