const channelPlaying = client.channels.cache.get(...);

setInterval(function () {
  ...

  function getPlaying() {
      return fetch(APILink).then(res=>res.json()).then(jsonData=>jsonData.data[0].playing)
  };
  getPlaying().then(playing => {
    const strPlaying = String(playing).trim();
    channelPlaying.setName(`🎮 Playing: ${strPlaying}`)
  })
}, 10 * 60 * 1000);

const channelPlaying = client.channels.cache.get(...);

setInterval(function () {
  ...

  function getPlaying() {
      return fetch(APILink).then(res=>res.json()).then(jsonData=>jsonData.data[0].playing)
  };
  getPlaying().then(playing => {
    const strPlaying = String(playing).trim();
    channelPlaying.setName(`🎮 Playing: ${strPlaying}`)
  })
}, 10 * 60 * 1000);