how do i open modal with javascript. without using jquery

How do I make a modal visible with javascript? I don’t want to do it using jquery. i just want it with javascript. And I don’t want it to open when I click a button. I want it to be opened as a result of some operations in javascript. I made it with modal bootstrap. my codes are below.

html code:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous">
    <title>Document</title>
</head>
<body>
    <div class="modal fade" tabindex="-1" id="sonucModal">
        <div class="modal-dialog">
          <div class="modal-content">
            <div class="modal-header">
              <h5 class="modal-title">Test Durumu</h5>
              <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
            </div>
            <div class="modal-body">
              <p id="durum"></p>
            </div>
            <div class="modal-footer">
              <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Çıkış</button>
              <button type="button" class="btn btn-primary">2. Aşamaya Geç</button>
            </div>
          </div>
        </div>
      </div>
    <div class="container" style="height: 100vh;">
        <div class="row" style="height: 100vh;">
            <div class="col-md-12 d-flex justify-content-center" style="height: 400px;">
                <div class="card" style="width: 25rem; margin-top:20vh; ">
                    <div class="card-body" style="text-align: center;">
                        <h5 class="card-title text-primary">Soru</h5>
                        <span class="text-black-50 fs-5" id="soru"></span>
                        <input class="w-100 form-control mt-4" type="text" id="cevap"/>
                        <button class="btn btn-outline-primary mt-4 w-100" id="ok">Tamam</button>
                    </div>
                    <ul class="list-group list-group-flush">
                        <li id="anaCan" class="list-group-item fw-bold">Kalan Can: <span id="can"></span></li>
                    </ul>
                </div>
            </div>
        </div>
    </div>
        
    <script src="https://code.jquery.com/jquery-3.6.0.js" integrity="sha256-H+K7U5CnXl1h5ywQfKtSj8PCmoN9aaq30gDh27Xc0jk=" crossorigin="anonymous"></script>
    <script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js" integrity="sha384-ka7Sk0Gln4gmtz2MlQnikT1wXgYsOg+OMhuP+IlRH9sENBO0LRn5q+8nbTov4+1p" crossorigin="anonymous"></script>
    <script type="text/javascript" src="index.js"></script>
</body>
</html>

javascript code:

var turkceCumleler = [
    "Merhaba",
    "İyi Sabahlar",
    "İyi Günler",
    "İyi Akşamlar",
    "İyi Geceler",
    "Tekrar Görüşmek Üzere(Yüz yüze)",
    "Tekrar Görüşmek Üzere(Tel.)",
    "Yakında Görüşürüz",
    "Güle Güle"
    ];
var almancaCumleler = [
    "hallo",
    "guten morgen",
    "guten tag",
    "guten abend",
    "gute nacht",
    "auf wiedersehen",
    "auf wiederhögen",
    "bis bald",
    "tschüss"
]

var sayilar = [];
var healt = 3;

const getQuestion = () =>{

    document.getElementById('can').textContent=healt;
    
    let rastgele = Math.floor(Math.random()*turkceCumleler.length);
  
    if(sayilar.indexOf(rastgele) === -1){
        sayilar.push(rastgele)
        document.getElementById('soru').textContent = turkceCumleler[rastgele];
        document.getElementById('cevap').value = ""
    }else{
        getQuestion();
    }

    if(sayilar.length === turkceCumleler.length){
        //here i want modal to open
    }
       
}

const compareQuestionAnswer = () =>{
    
    if(document.getElementById('cevap').value === ''){
        alert("boş geçilemez")
    }else{
        let deger = almancaCumleler.indexOf(document.getElementById('cevap').value.toLowerCase());
        
        if(deger === -1){
            healt--;
            document.getElementById('can').textContent=healt;
            if(healt === 0){
                document.getElementById('anaCan').style.color='red';
                document.getElementById('ok').disabled = true;
            }
        }else{
            let deger1 = turkceCumleler.indexOf(document.getElementById('soru').textContent);
            
            if(deger === deger1){
                getQuestion();
            }else{
                healt--;
                document.getElementById('can').textContent=healt;
                if(healt === 0){
                    document.getElementById('anaCan').style.color='red';
                    document.getElementById('ok').disabled = true;
                }
            }
        }
    }
    
}

window.onload = getQuestion;
document.getElementById('ok').addEventListener('click',compareQuestionAnswer);
document.getElementById('anaCan').style.color='green';