I lost my iPhone but don’t recall my Apple ID.

If you forgot your Apple ID, you can try to recover it here: https://iforgot.apple.com/password/verify/appleid

Start here for a lost phone: If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support

If you have any other Apple devices you can try using Find My to find the phone or you can try calling the phone with another one also you can try reseting your Apple ID : https://iforgot.apple.com/password/verify/appleid

Hope this helps :D