I bought once and the price went down too much.
That was my worst 'mistake' i would say.
But in your case i would think that you learned something and we should 'predict' if the price will go up or down.
For now bitcoin is only rising rapidly and it is going to reach soon $300.
Yes i think the price will continue increasing till the next halving coming on the summer. So i think holding Bitcoins nowadays is profitable idea. However we have to take care always and try to predict if the price will go up or down before buying bitcoin