Ilustrator, White Outline

I am trying to keep the white outline on an image I created in Ibis Paint. I usually use the High Fidelity preset on Image Trace to improve my final images before uploading for print. However, I can't find a way to keep my white outline while making the image a higher resolution. I used Outlines with Image Source and exported it. It's a higher quality image but it's at half the transparency and vibrancy from before. (I am very new to all of Adobe and Illustrator so I'm literally just picking settings and hitting buttons.)