This page plays through your speakers. Your streaming tool only captures your microphone, so viewers hear a faint echo at best. Route the browser tab into the stream instead:
Install a virtual cable (VB-Cable or Voicemeeter on Windows, Loopback or BlackHole on Mac). Set this browser's output to the cable, add the cable as an input in your streaming tool, and everything you play here goes straight into the stream at full quality.
On a computer dialer (Zoom Phone, Dialpad, Aircall) use the virtual cable route above. On a cell phone, hold it near your speaker. It works, but it sounds like a speakerphone.