It maybe risky but it is going to depend on how you are going to see bitcoins risky so if you think that bitcoin is quite good enough then invest but if you think that too much investing in bitcoins is going to put you in a bad place then don't just simply invest. But remember those people who are able to get rich because of investing and holding bitcoins for a long time.
even when you invest in bitcoin you should be active with it, and despite the fact that i am one of the long term holders of bitcoin i always say keeping coins idle in your cold storage is not helping anyone and if we want to see bitcoin thrive we must start with ourselves and start using bitcoin more often even if it is investing in other things or better yet buying stuff with bitcoin.
Yes it is a must that we should keep on monitoring it and be active with it, because there is no type of investment that you just leave your money and let it grow without monitoring. Even though that holding is like that, we still need to monitor it daily and you need to set your own price range before selling in able to get profit because fluctuations with bitcoins price is happening daily.