I invested about $3500 in bitcoin on 19th December, 2017. After that Bitcoin price has been decreasing and this decreasing is ruing non stop. Now I am in loss amount of $700. I am so much frustration with my investment

. I am waiting for better time. If you have any idea please share in this thread.

I think that it is necessary to wait, because bitcoin will grow further, but not so quickly. Now, in order for it to grow it is necessary to invest even more money into it.
That is a consequence. The most influential thing is the timing in decision making, if you look at all then I predict the price of bitcoin can experience an increase again and the decline is a thing that will always happen. All the precious things in the world will surely decrease and increase. So when we experience a loss it means we still have not found the right time, so please think again how we should determine the time to buy and sell the bitcoin we have. It is a valuable lesson and that is the trademark of trading.