Creative PowerPoint Design Enhancement

I have all the slides written and organised; what I need now is a visual makeover. The goal is to transform the existing deck into a creative, colourful presentation that feels fresh yet coherent with my brand... (Budget: $30 - $250 USD, Jobs: Adobe Creative Cloud, Adobe Illustrator, Adobe Photoshop, Branding, Graphic Design, Logo Design, Photoshop, Powerpoint)