Easily apply templates to your category archive pages and posts with this plugin.
Valid templates are files placed your theme folder with the following code at the beginning of them:
For Post Templates: Template Name: Blog Template
For Archive Templates: Archive Template: Blog Template
Through this plugin’s options panel, you can choose which templates are applied to categories and posts. Even choose their priority over one another. You can even apply a template to an individual post. 
Please <a href="http://aarongloege.com/blog/web-development/wordpress/plugins/wordpress-plugin-category-templates/#respond" rel="nofollow ugc">report any bugs</a> you come across.
Enjoy!

Category Templates

Give your categories and posts their own individual templates.

envato

A Template Kit is a collection of pre-designed starter templates for a WordPress Site Builder that share a cohesive visual style.
You can use this plugin to Import Template kits for Elementor.
Once this plugin is activated go to “Tools” > “Template Kit” to begin importing.

Template Kit – Import

Use this plugin to import Template Kits to WordPress

Category Templates vs Template Kit – Import