Fixing Navigation Stack and Navigation Bar in SwiftUI iOS app

Hi,
I'm not a professional developer, but I’ve built an iOS app in SwiftUI that works quite well overall. However, after updating to the latest version of Xcode, I started having issues with the navigation stack and navigation bar behavior.
I’d like to clean up and properly organize the navigation throughout the entire app. The app has a tree of about 5–6 screens, and I use three different styles of navigation bars (headers) depending on the screen type.
I’m looking for someone experienced with SwiftUI (and ideally NavigationStack / NavigationSplitView) who could help me fix the structure, unify the navigation headers, and make everything consistent and stable again.
Please let me know your availability and estimated cost for reviewing and correcting the navigation flow.
Thanks!
Bartosz