Aaron D. Campbell

This plugin allows you to manually enter links that are related to a post. They 
can be on any site and you can enter just the URL or an entire link (specifying 
the title attribute, onclicks, etc). There are helper functions to display them 
in your theme or you can simply tell the plugin to automatically add them to 
posts or even just single posts. The list is output as an unordered list (ul) 
with an optional title, and everything has CSS classes to make styling easy. 
Requires PHP5.

Manual Related Links

A related links plugin that allows you to manually specify links, even if they're on another site. Requires PHP5.

TranHoangQuoc

Hide related video youtube is a plugin remove related video other chanel when you use YouTube oEmbed.
On activation, the plugin clears the oEmbed cache so that the videos can be successfully re-cached with the new setting. If you are upgrading the plugin, you may need to manually deactivate, then reactivate it to clear the cache.

Hide Related Video Youtube

With the new Gutenberg editor, this is a must as the rel=0 does not work with the YouTube block.

Love it!

It's plugin not working!

If it is not working for you, clear your page cache.

Thank you.

Perfect, it still works fine for embedded YouTube video

Hide related video youtube is a plugin remove related video other chanel when you use YouTube oEmbed.

Manual Related Links vs Hide Related Video Youtube