I mistakenly deleted keychain passwords from i cloud

Hello sarsan224,

Once you remove a passkey or password for iCloud Keychain there isn't a way to restore it. You can manually add it back if you wanted.

1. Tap Settings, then select Passwords. In iOS 13 or earlier, select Passwords & Accounts, then tap Website & App Passwords.
2. Use Face ID or Touch ID when prompted, or enter your passcode.
3. Tap + to manually add an account and password.

For more ways to save your paswords, check this out: How to find saved passwords and passkeys on your iPhone - Apple Support

Thanks.