<select name="shot-result" class="custom-select" id="shotresult">
                        option value="all">All Shots</option>
                        option value="Made">Made</option>
                        option value="Missed">Missed</
</select>

{
  "type": "Feature",
  "properties": {
    "ID": 2,
    "SEASON_SHO": "1998-1999",
    "GAME_TYPE": "Regular",
    "PERIOD": 1,
    "MINUTES_RE": "06:25:00",
    "ACTION_TYP": "Jump Shot",
    "SHOT_TYPE": "2-PT-Wurf",
    "SHOT_DISTA": 15,
    "GAME_DATE": "05.02.1999",
    "HEIM": "SEA",
    "GAST": "DAL",
    "GEGNER": "Seattle SuperSonics",
    "SHOT_ATTEM": 1,
    "SHOT_MADE_": 0
  },
  "geometry": {
    "type": "Point",
    "coordinates": [
      -0.314959,
      -0.159125
    ]
  }
}

var url = 'data/Wuerfe.geojson';
var allewuerfe;

allewuerfe = L.geoJson(null, {

    onEachFeature: onEachFeature,
    style: style,
    pointToLayer: function (feature, latlng) {
        return L.circleMarker(latlng, allewuerfe);
    }
});

$.getJSON(url, function (data) {
    allewuerfe.addData(data);
});

var data = L.layerGroup([
    ]);
data.addLayer(allewuerfe);
data.addTo(map);

<button class="btn reset-btn" id="all">Reset</button>

document.getElementById("all").addEventListener('click', function (event) {
    data.clearLayers();
    data.addLayer(allewuerfe);
    data.addTo(map);
});

<select name="shot-result" class="custom-select" id="shotresult">
                <option value="all">Alle Würfe</option>
                <option value="Made">Getroffen</option>
                <option value="Missed">Verworfen</option>
            </select>