WordPress Monsters

You can create templates (layout) for your pages to add some blocks of content before/after general content.
Also you can assign your template to custom post type(archive or single), taxonomies, 404 and search results pages, this options can be found in Templates->Settings menu in admin console.
You should use
<pre><code>[wpm-template-content]
</code></pre>
shortcode in this templates to separate content.
Watch how to use Template Manager plugin in this cute short video:
<iframe loading="lazy" title="Template Manager by WordPress Monsters" width="750" height="422" src="https://www.youtube.com/embed/jY2T-ZuUfSE?feature=oembed" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>

Template Manager by WordPress Monsters

This is a temlate manager plugin for easy WordPress development from scratch when you are use Page Builders plugins.

Ellen Bauer

The AinoBlocks website builder blocks are a collection of blocks for the Gutenberg block editor. With AinoBlocks and our Full Site Editing block themes you can create professional websites with ease.
<h3>Resources</h3>
AinoBlocks WordPress plugin bundles the following third-party resources:
Phosphor Icons 
Copyright (c) 2020 Phosphor Icons 
License: MIT License, https://raw.githubusercontent.com/phosphor-icons/phosphor-home/master/LICENSE 
Source https://phosphoricons.com/

AinoBlocks – Gutenberg Website Builder Blocks

Tried and loved it.

A great solution if you don't care about performance, but it loads 100s of KBs of extra CSS without even adding a single block.

That should be taken care of.

Simple, Beautiful and Flawed!

A collection of blocks for the Gutenberg block editor to build professional WordPress websites.

Template Manager by WordPress Monsters vs AinoBlocks – Gutenberg Website Builder Blocks