...

1. Leave it alone. If the package truly weighs too much, it weighs too much.
2. The weight for the item may be incorrect.
3. The weight restriction for the shipping method may be incorrect.

Remediation Steps

To change shipping method weight restriction

Navigate to your shipping method:

Home → Configuration → Checkout → Shipping

Click on the Methods tab.

 Image Added Image Removed
Click

From the Methods screen, click the Edit button for your shipping method.
Image Removed
Scroll down (a lot

Image Added

While Inside the particular shipping method (UPS:Ground in this case), click on the Restrictions Tab

Image Added

At the Restrictions screen, scroll down (way, way down) to the Weight Restrictions section.
If you wish there to be NO restrictions, then blank out the fields (do not enter zeroes!). If you wish to increase the restriction, then add a higher number.

  Image Removed

Image Added

Save your changes and retest.

To change item weight

Navigate to:

Home → Items → Item Management

Select your item from your item list by clicking on the item id.
In the middle of the first column of the item attributes is a field for weightScroll down to the Shipping section.  There you'll find the Weight and Dimension fields. Adjust it if you feel it is incorrect.

Image RemovedImage Added

Click the Save button when finished.