Leaflet highlight GeoJSON points within the other highlighted GeoJSON polygon

I would like to have all the points highlighted within the other highlighted GeoJSON polygon.

Next, I would like to have them displayed in the panel next to or at least in the console (for now).

The problem is, that code I provided doesn't work. I can't see these points anywhere.

     var ptsWithin = turf.within(placesLayer.toGeoJSON(), total.toGeoJSON());

     map.on('draw:created', function (e) {
     placesLayer.clearLayers();
     layer = e.layer;
     placesLayer.addLayer(layer);
     GetSelection(placesLayer);
     });

     function GetSelection(layer){

var shape2 = placesLayer.toGeoJSON()  //All facilities
var ptsWithin = turf.within(total, layer.toGeoJSON());

    alert('Found ' + ptsWithin.features.length + ' features');  
    alert("results "+JSON.stringify(ptsWithin));

};

which I've picked up from here:

Leaflet and Turf.js Points within poly

I also tried another approach:

 var eclplaces = total.toGeoJSON().geometry.coordinates
 placesLayer.eachLayer(function (layer) {
 if(turf.booleanContains(eclplaces, layer.toGeoJSON().geometry.coordinates)){
      selPts.push(layer.feature);
  }

but with no effect at all.

The same as this code:

Determine if a point reside inside a leaflet polygon

Is there any way to highlight and list the points, which are located inside the highlighted polygon?

My full code is here:

http://01.mlearnweb.online/

UPDATE:

I found another option here:

https://github.com/hayeswise/Leaflet.PointInPolygon

Determine if a point reside inside a leaflet polygon

but these functions are not suitable with my problem.

from Leaflet highlight GeoJSON points within the other highlighted GeoJSON polygon