It is always the right time to invest in Bitcoin as its kept on increasing on a daily basis despite the fact that at times there is a decline in the market value of Bitcoin due to technical or fundamental issues affecting Bitcoin and crypto currency at large.
As an investor, we already know how potential Bitcoin is going to be, but people who don't have experience will have a lot of negative thoughts about the Bitcoin market. So it is always good to invest in Bitcoin when it is below $10k.