My Add Event Listener isn't working but doesn't throw an error though

I searched everywhere to seek a solution to my problem but I didn't succeed. My problem is that my AddEventListener is not working but it doesn't throw an error. Here my code :

index.html

class="row partie" id="project">
        <div class="col-12">
          <h1>Mes projects</h1>
          <p class="description">Je mets ici tous les projects que j'ai faits.</p>

          <div id="tous_projets">
<div id="form_projet"><form id="form_projet">
    <p>
        <label for="titre">Titre</label> : <input value="a" type="text" name="titre" id="titre" placeholder="Titre" required />
        <br />
        <label for="description">Description</label> :
        <textarea name="description" id="description" placeholder="Description" required>a</textarea>
        <br />
        <label for="lien__page_web">Lien de la page web</label> : <input value="https://ok" type="url" name="lien_web" id="lien__page_web" placeholder="Lien du site web" required />
        <br />
        <label for="lien__image">Lien de l'image</label> : <input value="a" type="text" name="lien_image" id="lien__image"
        placeholder="Lien de l'image" required />
        <br />
        <label for="lien__github">Lien du GitHub</label> : <input value="https://ok" type="url" name="lien_github"id="lien__github" placeholder="Lien du Github" required />
    </p>

    <input type="reset" value="Reset" class="reset_button">
    <button type="submit" class="validate_button" id="project_submit" disabled>Valider</button>
</form></div>
</div> <!-- Cest ici que la liste des projets apparaitront-->

          <!-- Bouton pour ajouter des projets-->
          <div class="btn_plus__div">
            <div id="add_projet"></div>

            <button class="btn_plus" id="projet_ajouter" type="button"><img src="images/home/green-plus.jpg"
                width=40 /></button>
          </div>
        </div>
      </div>

and my index.js

const projet = document.getElementById("projet_ajouter");
const add_projet = document.getElementById("add_projet");
const form = document.getElementById("form_projet");

const aFunc = function() {
    let ValidateBut = document.getElementById("project_submit");
      console.log(ValidateBut);
      ValidateBut.addEventListener("click", (event) => {
        alert("a");
      });
    };

projet.addEventListener("click",  () => {
  add_projet[removed] = Form_ajouter_projet;

  
    aFunc();
});

It will be great if I could have an answer.

PS: I don't know which part I had to develop and explain so you are free to ask me everything (that's a bit normal though).