Another reason why Bitcoin struggle to pump this year is because of too many Altcoins, ICOs and there's more to come this year.
In the past year the Crypto-Currency market has listed almost 2,000 different cryptocurrencies, there's too much coins to choose which to invest and some of them are scams.
Young cryptocurrency enthusiasts and investors today don't choose Bitcoin as their future or long-term goals but instead on top Altcoins that would likely has the potential to be the next Bitcoin in the future.
Wow really dude? "Another reason why Bitcoin struggle to pump this year" -- When you say that I am assuming you are referring to last year? Since this year started 3 days ago.
Certainly you didn't just say Bitcoin struggled to pump last year -- I'd say going from around $950 in January to $17,000 in December would be considered a "pump" ...
Also, "your cryptocurrency enthusiasts and investors today" DO choose Bitcoin. Most people who are "young" or new to the crypto world, don't know alts even exists. All they know is that they saw Bitcoin on Forbes or their local news and that they need to buy some.