Randomly blinking multiple LED's without delay

Hey guys,

I'm working on a code to randomly blink without (delay), and uses if and else functions to incorporate a sensor too..
I just want to expand the code to include more than 1 LED, however at the moment with 2 LED's they just blink randomly together as a pair.
Is there a way so they individually blink randomly?

here's the code:

// LED gets brighter the less light the LDR recieves

#define LED1 9 // pin that LED is attached to
#define LED2 10


int Val = 0; // variable used to store the value coming from the sensor
int ledState = LOW;             // ledState used to set the LED
long previousMillis = 0;        // will store last time LED was updated

long randNumber;

void setup() {

  
    pinMode(LED1, OUTPUT);  // LED is an OUTPUT
    pinMode(LED2, OUTPUT);  // LED is an OUTPUT
    randomSeed(analogRead(2));
                        // Analogue pins are autmatically set as inputs


}

void loop() {
     
  
 if ((Val = analogRead(0)) < 600)    // read the value from the sensor
 {
 analogWrite(LED1, 255-Val);  // turn LED on at brightness set by sensor value
  analogWrite(LED2, 255-Val);  // turn LED on at brightness set by sensor value
 delay(10);    // stop the program for some time 
 }
 
 else if ((Val = analogRead(0)) > 600)
{
  randNumber = random(0, 150000);
  unsigned long currentMillis = millis();
 
  if(currentMillis - previousMillis > randNumber) {
    // save the last time you blinked the LED 
    previousMillis = currentMillis;   

    // if the LED is off turn it on and vice-versa:
    if (ledState == LOW)
      ledState = HIGH;
    else
      ledState = LOW;

    // set the LED with the ledState of the variable:
    digitalWrite(LED1, ledState);
        digitalWrite(LED2, ledState);
  }
  }
 
}

Is there a way so they individually blink randomly?

Yes write it correctly.
Do not create a random number each time round the loop.
You need one random number plus the current time for each LED initially defined in the setup and hold it in a variable.
Then when this exceeds the current time you toggle your LED and create another random number plus the current time.