Few suggestions

Here are my suggestions for this plugin:

1. Add CSS z-index: 1 for the play icon and time, because they are not showing on the Just Write theme, and possibly many other:

.mxyt-videolink .mxyt-play { z-index: 1 }
.mxyt-videolink .mxyt-time { z-index: 1 }

2. Make it so the plugin doesn’t require a shortcode. Using shortcodes for a plugin like this is very restricting for website owners. If they decide to use another plugin, or not use any plugin at all, they can’t, because the videos are inside the shortcode, not a regular YouTube links. Create custom options which can hook themselves to regular YouTube links.

Take a look at these two plugins and see how they work:
* Lazy Load for Videos
* WP YouTube Lyte

3. Make an option to use high quality thumbnails (maxresdefault.jpg) instead of a standard ones (mqdefault.jpg). Stadard thumbnails have a very low resolution and therefore they are ugly when displayed on a 600+px website content width.

So, instead of this: https://i.ytimg.com/vi/TjVMKUpmsM0/mqdefault.jpg,
make an option for this: https://i.ytimg.com/vi/TjVMKUpmsM0/maxresdefault.jpg

4. This suggestion is similar to the second one, and it’s about using this plugin for any video we would like. Don’t constrain users to embed only their videos. Since it is possible to edit the video ID to show any video, why not make it to directly browse and embed any YouTube video via the plugin’s GUI? Again, it would be better just to copy-paste a YT link instead of using the plugin’s GUI and its shortcodes.

Thank you.

https://www.ads-software.com/plugins/mxyoutuber-responsive/