// ...other imports and then,
import { MarkerClusterer, GridAlgorithm } from "@googlemaps/markerclusterer";

// ... your other map code here

/* Note:
GridAlgorithm seems to be better then the default or 
standard algorithm which is SuperClusterAlgorithm
*/
const algorithm = new GridAlgorithm({
  gridSize: 60
});
new MarkerClusterer({map, markers, algorithm});