enomoto celtislab

You are using a tag cloud of the standard, and you do not want to display tags that belong to the category not related to the article. 
Try this widget. 
Based on the category of the display article, this widget gets the tag from the article categories of related range. 
For the article there is no category of post page, etc., or by setting <code>all category</code>, <code>internal link article</code>, it displays the tag by examining the related category. 
If you check the ‘internal link article’, get a category from the internal links to articles.
Select Category related range
<ul>
<li>All Category (unrelated article)</li>
<li>Current article Category</li>
<li>Include child category tree</li>
<li>Include parent category tree</li>
<li>Include internal linked article Category</li>
<li>Exclude Category</li>
</ul>
Other parameters : Display format, Sort by, Order, Font size, Number of tags to display, …
<a href="http://celtislab.net/wp_plugin_DCTagCloud/" title="Documentation in Japanese" rel="nofollow ugc">日本語の説明</a>

DynamicCategoryTagCloud

Displays the tag cloud dynamically from related articles belonging to the category of the display article

Christoph

Make your WordPress site stand out with a colorful tag cloud. Display your tags in a spiral or in waves.
<h3><a href="https://demo.chattymango.com/creative-tag-cloud-demos/?pk_campaign=ctc&pk_kwd=readme" rel="nofollow ugc">★ Try The Demos ★</a></h3>
<a href="https://chattymango.com/creative-tag-cloud/?pk_campaign=ctc&pk_kwd=readme" rel="nofollow ugc">Features</a> | <a href="https://documentation.chattymango.com/documentation/creative-tag-cloud/?pk_campaign=ctc&pk_kwd=readme" rel="nofollow ugc">Documentation</a> | <a href="https://chattymango.com/?redirect_to=latest&cat=140&pk_campaign=ctc&pk_kwd=readme" rel="nofollow ugc">Latest Development Blog Post</a>
This plugin provides two tag clouds:
<ol>
<li>Display your tags in a spiral, starting outside from the most-used tags.</li>
<li>Display your tags in horizontal waves, starting left from the most-used tags.</li>
</ol>
These tag clouds can be inserted in posts and pages with shortcodes or in widget areas with widgets.
Please don’t expect the tag clouds to look perfect out of the box. There is a variety of parameters to fine-tune the size, the number of waves, cycles, distances and so on and you will need to adjust them to the number of tags, the available space and so on.
You can find more information on the <a href="https://chattymango.com/creative-tag-cloud/?pk_campaign=ctc&pk_kwd=readme" title="plugin website" rel="nofollow ugc">plugin website</a>.
The documentation is available <a href="https://documentation.chattymango.com/documentation/creative-tag-cloud/?pk_campaign=ctc&pk_kwd=readme" rel="nofollow ugc">here</a>.
If you find this plugin useful, please give it a <a href="https://wordpress.org/support/plugin/creative-tag-cloud/reviews/?filter=5" title="reviews" rel="ugc">5-star rating</a>. Thank you!

Creative Tag Cloud

Make your WordPress site stand out with a colorful tag cloud. Display your tags in a spiral or in waves.

DynamicCategoryTagCloud vs Creative Tag Cloud