Need High-Quality Image Upscaling for 14ft x 4ft Print (Art Files)

I’m looking for someone with expertise in AI upscaling and image enhancement to help me prepare 12 artwork files for large-format printing. These will be printed at 13’11” x 4’ in size (roughly 167 x 48 inches), and we need the highest quality output possible—the kind where viewers can walk up close and still see crisp detail.

Here’s the situation:
• I already have the 12 images, but when zoomed in, they start to get blurry.
• Multiple printers have told me the current resolution is not enough for maximum quality at that scale.
• I need you to analyze the current image quality, then upscale or enhance the files using AI tools to ensure print-readiness at massive size.

What I’ll provide:
• A Google Drive folder with the 12 artwork files:
• Any specs from the printer if needed.

What I need from you:
• Upscaled versions that maintain sharpness and detail at the full print size
• Final files in a high-resolution TIFF, PNG, or print-ready PDF format
• A short explanation of what you did to enhance the quality

Looking to get this done quickly and correctly. Quality is top priority.
Let me know your process, tools, and turnaround time.