Bitcoin's growth began in early 2017 and then it touch 20000. Bitcoin's largest growth is due to the ability to trade with tether dollar. With this growth, a huge growth in ICOs appeared. Nowadays about 30 ICOs are added to the market. This huge volume of ICOs, has taken the power of bitcoin growth. Like weeds next to a tree. Bitcoin will not grow until ICOs exists.
Well the tree still grows even when weed is around the tree.
Also Bitcoin did not started growing in 2017 but in October 2015. That was the tipping point of Bitcoins growth.
There will be ICOs all the time: And no matter that Bitcoin wills tart growing somewhere mid next year. Slow but steady.