loop through all unique tags across your products, list products according to those unique tags.

Listing Shopify Products by Tag

Demo: https://stone-digital-test.myshopify.com/pages/tag-loop-example

<!-- Step 1) create comprehensive list of all tags ie. tags_list -->
{% capture tags_list %}
    {% for product in collections.all-products.products %}
        {% for tag in product.tags %}
        {{ tag | strip | strip_newlines }}{% if forloop.last == true %}{% else %},{% endif %}
        {% endfor %}{% if forloop.last == true %}{% else %},{% endif %}
    {% endfor %}
{% endcapture %}

<!-- Step 2) turn tags_list into tags_array -->
{% assign tags_array = tags_list | split: ',' | uniq %}

<!-- Step 3.0) loop thru all unique tagzz ... -->
<!-- "tagzz" being our little nickname for "tags" -->
{% for tagzz in tags_array %}
    <h1>{{ tagzz }}</h1>
    <!-- Step 3.1) ... then loop thru all products ... -->
    {% for product in collections.all-products.products %}
    <div class="tag-list-page__outer">
    <!-- Step 3.2) ... then, if product tag matches our unique tag then list product. -->
    {% for tag in product.tags %}
    {% capture little_tag %}{{ tag }}{% endcapture %}
        {% if tagzz contains little_tag %}
            <div class="tag-list-page__tile">
                <img src="{{ product | img_url: '300x300' }}">
                <a href="{{ product.url }}">
                {{ product.title }}
                </a>
            </div>
        {% endif %}
    {% endfor %}
    </div>
{% endfor %}