Many articles and blogs posts has tried to tell us the writers viewed on the current bull trend but I think the major reason for the current bull run was that the bearish momentum that started in December 2017 when bitcoin hit it apex has end in December last year and since it has ended people start to have confidence on the market and are investing.
With investors and traders begin to pumped again the market, the bearish season will be reversed to bull, it's the determination to bring good calls while you are around this industry, market trends will give you positive position if you'll play right with how traders and investors did.