drawing not updating every time I change coordinates in a loop

Question

I'm trying to make a space invaders game and I've got an issue where I'm trying to move the spaceinvaders in a loop [though the code shows an iteration of 5 movements in a for] but they aren't updated in the window.

as you can see from the picture, the spaceinvaders have been moved to the right only once, after the iterations of run() have ended

import java.awt.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.swing.*;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.StyledDocument;

import java.util.Random;

public class SpaceInvadersPanel extends JPanel {

    boolean running = false;
    
    int indice = 0;                     //placeholder
    int fine = 10;                      //placeholder
    int speed = 10;                     //placeholder
    String correctAnswer = "prova";     //Placeholder
    
    Aliens[] alien = new Aliens[fine];
    int alienX = 35;
    int alienY = 35;

    SpaceInvadersPanel(int SCREEN_WIDTH, int SCREEN_HEIGHT) throws IOException, InterruptedException {
        
        this.setPreferredSize(new Dimension(SCREEN_WIDTH, SCREEN_HEIGHT));
        this.setBackground(Color.white);
        this.setFocusable(true);
        
        startGame();
        
    }
    
    public void startGame() throws IOException, InterruptedException{
        
        newSpaceInvader();
            
    }
    
    
    public void newSpaceInvader() {
            
        for(int i = 0; i<alien.length; i++) {
                        
            alien[i] = new Aliens(alienX, alienY, speed);
            alienX += 50;
            if (i == 4) {alienY += 50; alienX = 35;}
            
            }
    }
    
    public void paintComponent(Graphics g) {
        
        super.paintComponent(g);
        try {
            try {
                draw(g);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        } catch (IOException e) {e.printStackTrace();
        }
    }

    public void draw(Graphics g) throws IOException, InterruptedException {
        
        BufferedImage image = ImageIO.read(new File("C:\\Users\\39340\\Desktop\\", "spaceinvadersart40bianco.png"));
        g.setColor(Color.red);
        
        for(int i = 0; i<alien.length; i++) {
            
        g.drawImage(image, alien[i].x, alien[i].y, null);

        }
        
        run();

    }
    
    
    public void run() throws IOException, InterruptedException {
        for (int i=0; i<5; i++) {System.out.println("sono al run");
            move();Thread.sleep(500);}

    }
    
    public void move() throws IOException {
            
            for(int i = 0; i<alien.length; i++) {
            
            System.out.println("sto aumentando roba nel move");
            System.out.println("alien x = " +alien[i].x);
            alien[i].x += 50;
            System.out.println("ora alien x = " +alien[i].x);
            //alien[i].y += speed;

        }
        
    }
        
    public void checkCollision() {}

    public void gameOver(Graphics g) {}
    

}