Use a higher-resolution source image
Resize using AI upscaling tools
Sharpen the image carefully
Reduce noise before enlarging
Increase image dimensions in small steps
Use lossless file formats when possible
Adjust contrast and clarity
Fix blur with deblurring tools
Re-scan the original at higher DPI
Avoid excessive compression
Use professional photo editing software
Crop less to preserve detail
Improve lighting before taking the photo
Use a better camera or lens
Stabilize the camera to prevent blur