Hello Boss,
I will convert both your apps to the latest stable version of Xcode 11.6 and Swift 5. I know you can't able to upload the app with the existing version 10.3. After i update the version, you must use Xcode 11.6 and there will be no errors, i will update all libraries, frameworks etc.
BTW I am Jawad, Sr. iOS developer having 5+ years of professional development experience with Swift and Objective-c.
Let me know if you have any questions and when would you like to discuss our next step.
Kind regards,
Jawad Ali