I have similar apps with different design & color theme as per my different client. But Apple is now rejected my latest app as spam
Guideline 4.3 - Design - Spam
We noticed that your app provides the same feature set as other apps you've submitted to the App Store; it simply varies in content or language, which is considered a form of spam.
When creating multiple apps where content is the only varying element, you should offer a single app to deliver differing content to customers. Alternatively, you may consider creating a web app, which looks and behaves similar to a native app when the customer adds it to their Home screen. Refer to the Configuring Web Applications section of the Safari Web Content Guide for more information.
You will experience a delayed review process if you deliberately disregard the App Store Review Guidelines, ignore previous rejection feedback in future app submissions, or use your app to mislead or deceive users.
As a result of violating this guideline, your app’s review has been delayed. Future submissions of this app, and other apps associated with your Apple Developer account, will also experience a delayed review. Deliberate disregard of the App Store Review Guidelines and attempts to deceive users or undermine the review process are unacceptable and is a direct violation Section 3.2(f) of the Apple Developer Program License Agreement. Continuing to violate the Terms & Conditions of the Apple Developer Program will result in the termination of your account, as well as any related or linked accounts, and the removal of all your associated apps from the App Store.
We want to provide a safe experience for users to get apps and a fair environment for all developers to be successful. If you believe we have misunderstood or misinterpreted the intent of your app, you may submit an appeal for consideration or provide additional clarification by responding directly to this message in Resolution Center in iTunes Connect.
For app design information, check out the following videos: "Best Practices for Great iOS UI Design" and "Designing Intuitive User Experiences," available on the Apple Developer website.
You may also want to review the iOS Human Interface Guidelines for more information on how to create a great user experience in your app.
How can I resolve this?