You shouold trade money that you not afraid too loose. Thats the main rule of MM
Trading or investing in crypto currency with funds, capital that you are not afraid to lose is not a reason for you not to protect your capital. When we say protect your capital; it means guide or guard your investments or trade. You cannot just buy, invest and stop doing follow up. You have to continue to do your own research, follow price movements until you take profits. Trading with money you can lose, without doing due process will only lead to losses.