Upscale Photo for A0 Print

I have a single image that I need enlarged for professional printing at A0 size (1189 × 841 mm) with an extra 2 mm bleed, all at 150 dpi. The current file is too low-resolution and visibly pixelated. My goal is to keep the photo looking exactly the same—just sharper... (Budget: $10 - $30 USD, Jobs: Adobe Photoshop, Color Grading, Digital Art, Graphic Design, Image Processing, Image Upscaling, Photo Editing, Photoshop, Photoshop Design, Print Design)