First I would like to say that you have a good start, especially storing your Bitcoin in a cold wallet, more secure and it's important. I am quite sure that nobody times the market 100% correctly everytime, even professionals. Yes, Bitcoin might be very volatile, but if held for some years, the price usually pays off. It's smart that short term drops won't scare you, but no one truly knows if it'll skyrocket or dip further. Rather than going all in, consider DCA, buy smaller amounts over time. Since you invest such an enormous amount, spreading your entry may turn out to be less stressful for you and quite strategic. Though you probably won't need it, but good luck with your investment!