I am not a financial advisor by any means necessary, but I usually cannot answer that for you.
In the world of cryptocurrency, market is highly volatile and unpredictable. It could go down in just minutes due to the bad news we receive from the media, or it may go the other way around too.
In my seminars about cryptocurrencies and blockchain technology, I never convince people to invest or hold but rather saying "Invest or hold at your own risk" because it's only for risk takers who can afford to lose a certain amount of money.
I would say that it's a good buy or hold Bitcoin's when price was still around cents to a dollar though.