Before buying and investming in bitcoin or any other currencies perfect time is the key to gain some money. Check the market. Check the buy and sell margin. Btc dominance at coinmarketcap. Wait for dip and make a smart entry. I hope you will never lose
So your strategy is to buy when the price is low and sell when it is on top. It is one of the best strategy in any market and therefore, I bet you will earn a good amount of money
Never lose is daydream. It can never be fulfilled. You can only minimize it. That is a sad truth of investment