JSFiddle - React, Tailwind, and code Playground

HTML

<form>
<textarea type="text" name="1"></textarea>
<textarea type="text" name="2"></textarea>
<textarea type="text" name="3"></textarea>
<textarea type="text" name="4"></textarea>
<select name="sel_1">
   <option>1</option>
   <option>2</option>
   <option>3</option>
</select>
    <button type="submit" disabled="disabled">Сохранить</button>
</form>

JavaScript

$(document).ready(function(){
    $('textarea').keyup( function() {
        $('button').removeAttr("disabled");
    });
    
    $('select').change(function() {
        $('button').removeAttr("disabled");
    })
});