You can enter whenever if your opportunity skyline is long as BTC will never disillusion you in the event that you hold it for long-term. This defeat was arranged and the individuals who says that BTC have no esteem, buy gigantic amount of BTC in its ruin. At whatever point a major drop comes in BTC, it generally hit new high after that fall.
The best time to invest in btc is now as long as you want to hold for a long time. I see ethereum as another excellent investment at this period since the market is very long, expecting a bull run soon. projects like linkchain's LNK token will be an excellent choice for investors, with their ico2.0 coming up in Nov. 11 Besides, i thing anyone investing for short time gains should better trade instead
The people, who have been working with the cryptocurrencies for years state that by the end of 2019, Bitcoin will go up to 25 thousand. It is better to hold it longer then.