Something like this:
client.on(`message`, async function (msg){
});
I think you did this for every single command when instead you should probably put all of your commands in one like this.
client.on(`message`, async function (msg){
if(msg.content.startsWith(`!hello`)){
msg.reply(`Hi!`);
}
if(msg.content.startsWith(`!cya`)){
msg.reply(`Bye!`);
}
});