Hard

Hello all, I have a bit of an issue. I created an advertising design for print on paint.net, but it turns out that I created it on too low of a resolution (996x1342, 95.99 ppi). If I increase the ppi to 300, the print size would be 3.32x4.47 inches, which is too small. Is there a way to either move my layers onto a new canvas with a higher resolution or am I out of luck? As you can probably tell, I'm pretty new at this, so I apologize if this is a novice question. Thank you in advance.