I don't know much about coding myself but I followed someone's video (specifically this video:https://www.youtube.com/watch?v=tQjpv0OO5pA) on how to make embeds on discord using your own bot and I did what he showed on the video... It was outdated but there were people in the comment section helping each other out... But it didn't help me that much because I had the same problem all over again which is the embeds not showing up when I enter my prefix (which is !embed) even though I don't get any errors in visual studio code.
Why dont you try replacing the switch
statements with the following :-
//write instead of switch
if (message.content === `${prefix}embed`) {
let embed = new Discord.MessageEmbed()
.setTitle("test")
.setDescription("Test");
message.channel.send(embed);
}