I lost my iPhone 8 Plus’s and don’t remember my Apple ID to locate my phone

You’re logged-in here w/ an AppleID and password … ??? 🤔

Change your Apple ID password - Apple Support

If your are part of a family share; their FindMy might assist.

As might any other friends with whom you’ve shared your location.

As far as not knowing your own AppleID:

If you forgot your Apple ID email address or phone number - Apple Support

Bummer. Unless you can recover access to the account you were using on it, there is no way to track it.