For the bitocoin, you do not have to invest it to get more value. It will rise in value long term.
Is this for certain? I mean.. 5 years later and the value of bitcoins will surely be above what it is right now?
No one can really be sure about what will happen with bitcoin price and other cryptocurrency, if people can really sure, no one would sell their bitcoin in 2010 or 2011 back then when bitcoin price still below than $10. This is an unexpected thing.