cannot display pins near the user's location

I have more than 2000 location pins in SwiftData.

My model like this:

@Model class HaritaModel {

let id: Int
let sto_title: String
let sto_latitude: Double
let sto_longitude: Double
let sto_address: String
let sto_city: String
let sto_country: String


init(id: Int, sto_title: String, sto_latitude: Double, sto_longitude: Double, sto_address: String, sto_city: String, sto_country: String) {
    self.id = id
    self.sto_title = sto_title
    self.sto_latitude = sto_latitude
    self.sto_longitude = sto_longitude
    self.sto_address = sto_address
    self.sto_city = sto_city
    self.sto_country = sto_country
}

}

I want to take the user's location and show them the pins at a certain distance. I want these pins to be dynamically updated when the user pan or zoom the map.

The code I am trying to write is as follows:

//
//  HaritaTest.swift

//

import SwiftUI
import MapKit
import SwiftData

struct HaritaTest: View {
    
    @Environment(\.modelContext) private var contextHarita
    @Query private var harita: [HaritaModel]
    @State private var userPosition: MapCameraPosition = .userLocation(fallback: .automatic)
    @State private var userCoordinate: CLLocationCoordinate2D?
    var body: some View {
        Text("Total Boutique \(harita.count)")
        
        Map(initialPosition: { userPosition }) { haritaView in
          ForEach(harita) { point in
            if let userCoordinate = userCoordinate,
               let stoLatitude = point.sto_latitude,
               let stoLongitude = point.sto_longitude,
               let latitude = Double(stoLatitude),
               let longitude = Double(stoLongitude) {
              let coordinate = CLLocationCoordinate2D(latitude: latitude, longitude: longitude)
              if haritaView.contains(coordinate: coordinate) {
                MapPin(coordinate: coordinate)
              }
            }
          }
        }
        .onAppear {
            CLLocationManager().requestWhenInUseAuthorization()
            getUserLocation()
        }
    }
    private func getUserLocation() {
            if let userLocation = CLLocationManager().location {
                userCoordinate = userLocation.coordinate
            }
        }
}

struct HaritaTest_Previews: PreviewProvider {
    static var previews: some View {
        HaritaTest()
    }
}

can you support me?

thanks in advance