VTR - Cant increase it through C&D or Buying Shipping through Amazon

Hi,

My Question is

What should I do to improve VTR

My items are low priced so I have low profit margins and can't do expensive shipments

Any idea guys??

I am a small business seller, I was selling peacefully through C&D Integration

Had 2nd 48 Letters and LL

VTR used to say N/A (Not Applicable), don't know if Amazon had this policy and VTR said 0.5 something, cz I put some tracking for high-value orders (that were shipped separately)

Now that, it doesn't matter how I send it through 2nd signed-for or normal VTR does it improve

I tried to buy labels from Amazon, but all the options it gave for Royal Mail, don't provide Tracking and Amazon gives a warning that this method doesn't provide confirmation

though I did it, and still no improvement in VTR (havent tried Evri)

My Question is

What should I do to improve VTR

Do I have to go to the post office and do them one by one tracked or signed or what!!!

My items are low priced so I have low profit margins can't do expensive shipments

Any idea guys??