Investment decisions must be made based on your own available knowledge of the BTC market as there are many investors close to you who may not give you positive advice most of the time. I am a victim of this myself and I myself take very careful investment decisions.
Instead of relying on past price charts, you can research daily price charts and buy and sell statistics to make some predictions about the market.
That's why it is necessary to search by yourself because if you trust another person then there is no surety that his provided information will be accurate or false. Most of the time individuals choose that investment field from which their friends and relatives have made profit but it is not necessary that your friend will give you the same useful information which is used by him.
In the current age trust is a big issue and you cannot trust others easily so if someone tells you good about something then do some investigations and then describe whether to trust him or not. Once you get knowledge then nothing is impossible for you so you will go ahead with your own information and active mind.