Why I can’t create new account iCloud on my phone please? And what I should to do?

Maximum limit for creating Apple ID from the hardware address of iphone is three , you can't create more Apple ID accounts , however again sign in with your same Apple ID and it's account credentials ( in fact you have signed out the Apple ID ) in the empty fields or sign in with another apple id that was created from another Mac / iPad or different iPhone .

See the article 

Sign in with your Apple ID - Apple Support

Hello merencelline,

When you create your Apple ID, you can use it to sign into iCloud on your iPhone. This article shows you how to create an Apple ID on your iPhone:

How to create a new Apple ID - Apple Support

Create your Apple ID using the App Store on your device

1. Open the App Store and tap the sign-in button .

2. Tap Create New Apple ID. If you don't see this option, make sure that you're signed out of iCloud.

3. Follow the onscreen steps to provide an email address, create a strong password, and set your device region. The email address that you provide will be your new Apple ID.*

4. Enter your credit card and billing information, then tap Next. You can also choose None. Learn what to do if None isn't showing or you can't select it. You won't be charged until you make a purchase. 

Confirm your phone number. This can help to verify your identity and recover your account if needed. Tap Next.

5. Check your email for a verification email from Apple and verify your email address.

After you verify your email address, you can use your Apple ID to sign in to the iTunes Store, App Store, and other Apple services such as iCloud.

Best Regards.