I think you should buy bitcoin today. it's never too late to buy bitcoin. maybe the price will go down but it's only temporary .. and the price will come back up. if you ask your moment to buy bitcoin .. maybe it is very easy for bitcoin. you only buy bitcoin at a cheap price and sell it when it is expensive. but you should not sell it .. keep your bitcoin in a long time so you get a lot of profit. do not wait for bitcoin prices to go up as you will regret in the future.
You are right in one aspect. But the general trend which is being followed when comes a point you need to decide amongst buying and selling of Bitcoin is grab as much as you can when the market price is down and do not sell until and unless you have achieved that much profit which you want to earn. I think this is what the bottom line is.
You have a point also and yes it is true that your main goal is to gain not to lose. To think that when you were willing to invest you are also willing or accepting the fact that it has much more risks involved, and you were ready to gamble what you have for the sake of what you are aiming, so I guess you really need more experience for you to fully understand, anyway keep it up.