First things first: I don't think there's anything wrong with the design based on the screenshots. At least, nothing stands out as being so unusable that users would flee for your competitor. As for "Gen Z preferences", I don't think there's enough to go on here to prove that. I'm over 35 and have watched user interfaces go from the the fun, colourful and UNIQUE designs of the 2009-era iOS apps to the hyper-corporate…
Having worked at a company where our VCs demanded we "do what Google does" and then had to adopt the entire "design system" approach, it ends up robbing UIs of anything fun, because all UIs become "design by committee" by default.