I have also been creating beanie mockups, and I have a few tips that might help. First, it is very important to use high-resolution images. Bad or blurry photos can really ruin the final result. I also recommend using the Warp tool to bend and curve the logo so that it fits the shape of the beanie. For more realism, you can use layer masks and adjust the logo so that it blends harmoniously with the texture of the fabric. Using displacement maps will also help make the logo part of the fabric, adjusting to the folds. You can read more here https://www.ebar.com/story.php?ch=preview&sc=&sc2=&sc3=&id=336781. Try it, it should help!