How do I reset my iPhone XR without iCloud password?

At the risk of sounding pedantic, you CAN reset it but w/o your knowing your iCloud password it will remain Activation Locked and of no use to anyone until you DO have your iCloud password.

So carefully follow the instructions already provided to reset your AppleID password beforehand.

Your Apple ID is the account you use to access Apple services like the App Store, Apple Music, iCloud, iMessage, FaceTime, and more. It includes the email address and password you use to sign in as well as the contact, payment, and security details you use across Apple services.

You are likely using your Apple ID to log-in here to the Apple Community, to access Messages and FaceTime, and, at any time you log-in to your Apple ID Account online. You can also use it to log-in to iCloud.

If needed: see what to do: If you forgot your Apple ID - Apple Support

and

If you forgot your Apple ID password - Apple Support

More support: Apple ID Support webpage (info. / support / contact options etc.)

Apple ID - Official Apple Support

I suspect you mean you forgot the passCODE and not passWORD. There is a difference.

This article tells you the various ways you can try to discover your forgotten Apple ID --> If you forgot your Apple ID - Apple Support Typically an Apple ID is an email address you have used. If you are currently using a mobile device that is logged into your account, go to Settings and tap your name at the top. Look in Keychain, and in a browser's security settings if you use it to automatically sign into Apple when using a browser.

This article outlines what to do If you forgot your Apple ID password --> If you forgot your Apple ID password - Apple Support

or go directly to this link --> http://iforgot.apple.com/

If you find you can’t sign in, reset your password, or receive verification codes, you can request account recovery (read this support article: How to use account recovery when you can’t reset your Apple ID password - Apple Support ) to regain access to your account. Account recovery might take a few days or longer, depending on the specific account information you can provide to verify your identity. More detail in —> Activation Lockout Issues - Apple Community

If you still need help this page provides country-specific Apple Support contact information ➞ Contact Apple for support and service - Apple Support