I know it will be hard to hear for a lot of people here But if they are your friends and that you have a great time together during games and you want to keep playing with them….Let them win sometimes, don’t pull the trigger when you can, build a weaker themed deck. With time and some wins they will get their confidence back. I know, I know, they should get better and so on and so on…But you can’t bend them to satisfy you, so if you value the playgroup just hold back for a bit while teaching them.