Guideline 4.1
App is a copycat of another popular app
App closely mimics another popular app's UI, features, or branding. Apple rejects apps that are obvious clones of existing apps.
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Apple's rejection message
Guideline 4.1 - Design - Copycats: Your app or its metadata appears to closely mimic the design, functionality, or name of another popular app.
How to fix this
Redesign UI and add distinctive features
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Change your visual design to be distinctly different. Add unique features the original app doesn't have. Change the app name if it's too similar. Document your unique value proposition in App Review notes.