A0 Academic Poster Redesign

I need a clean, print-ready remake of my A0 conference poster (841 mm × 1189 mm, portrait). The draft I produced with an AI tool looks the way I want composition-wise, but the file is badly pixelated.... (Budget: $30 - $250 SGD, Jobs: Adobe Creative Cloud, Adobe Illustrator, Adobe InDesign, Adobe Photoshop, Graphic Design, Illustrator, Photoshop, Print Design)