Polish My Gamma Presentation Design

I’ve already built the entire deck in Gamma and hold an active subscription, but the visuals still feel a little flat. I need a designer with Gamma experience to give the slides a cohesive, polished look without rebuilding the structure... (Budget: £10 - £20 GBP, Jobs: Adobe Creative Cloud, Adobe Illustrator, Corporate Identity, Gamma, Graphic Design, Logo Design, Photoshop, Visual Design)