How can I use other ringtones that the standard ones that came on my pixel?
Copy the mp3 files of your choice to the user accessible ringtones folder on your phone's internal storage space. Same thing for custom notification tones and alarms.
I'm most definitely NOT a VZW employee. If a post answered your question, please mark it as the answer.
Another option is to use ZEDGE™ Ringtones & Wallpapers - Android Apps on Google Play