You have to adjust the size of the design and the details, as most designs appear from the middle of the abdomen and focus on the bottom of the shirt, not the top.

 - size of the print area: It’s better to edit it to 12×16 inches.
 - File resolution: 150 DPI  to 200 DPI

I suggest you redesign it as the following design^[1] with an abbreviation of the words like (Don't believe it. I Don't have the time to try to convince)
Also, the yellow color seems distracting.

[1] https://www.pinterest.com/pin/479492691559166814/