Good morning I am unable to see emails on this phone since Friday how can I fix

First of all, If you have an iPhone 7 and really running iOS 14 consider upgrading to iOS 15 via settings>general>software update

Second, try and remove the e-mailaccount and then add it again

1. On your computer, sign in to your email provider’s website. Make sure that all of your email is there or make sure that your email is saved somewhere other than your device.
2. On your device, go to Settings > Mail, then tap Accounts.
3. Tap the email account that you want to remove.
4. Tap Delete Account.
5. Add your account again.

If these steps don't work, contact your email service provider for more information.