Well most in the community are doing the same, They would sure buy on an All time low and sell on the All time high, Rinse and repeat, Very simple strategy for a hodler, But there are some who surely risk they even sell on an ATL because they only believe that the price will surely drop, Well I really think there are no other system on how you can properly Buy and sell on the market of Cryptocurrency.
That is only for people who really understand the cycles and how the price of bitcoin is influenced by news and other situations, if you try to do that uninformed, your cash will go down the drains.