In 1995, Charlie Munger gave a speech about how the human mind tricks itself into making poor decisions. This is an abridged and animated version of that speech. Charlie Munger: The Psychology of Human Misjudgement
The exact wrong people are holding waaaay too much cash. If you have 30+ years of investing runway (all millennials) and you are holding a lot of cash for no reason, you are doing yourself a great disservice. Start a simple, set it and forget it monthly process and don’t hurt your future self.