Speaker at the bottom of the phone not working

Ok, then see if the following support article can help:

• If you hear no sound or distorted sound from your iPhone, iPad, or iPod touch speaker - Apple Support

If not, then I think, at this point, your best bet would be to make a Genius Bar appointment at your local Apple Store or Apple Authorized Service Provider to have them take a look and provide you with your options. Alternatively, you can use the "Get Support" link in the upper right-hand side of this forum's web page to get started.

Only the right-side "port" on an iPhone X is actually a speaker. Are you referring to the left-side that "isn't working?"