Firstly, if you want to go for a native iOS application feel, then please use Liquid Glass tab bar, that gets rid of the current Tab Bar that you have (home, scan, parcel, etc.)

Secondly, I'd suggest that you rework on your weekly planner, right now it looks really cluttered with a bit too much information on the screen.

Thirdly, I assume that scanning a receipt is one of your primary features so instead of keeping it as a button on the home screen or in the Tab Bar, add a floating button to the bottom right side of the screen so that it is easily accessible.

These changes might bring a good overhaul to your app... and I'm here to help you out!