I think that investing in everything is risky especially bitcoin. Dont take anyones advice about what will happen with the currency. Personally I believe we are just starting, just my own opinion and you shouldnt consider that as investment advice as well.
I think Never invest more than you are able to lose Bitcoin is a very risky investment and you should keep in that in mind at all times. especially the price Bitcoin is still going down this time.
I don't know if there is a good time to buy bitcoin at the moment. I sill confused about dropping off the bitcoin price, it's too drastic. Usually bincoin price will bounce back no long after dropped but the trend is negative not like I imagine that in Desember 2017 how we optimistic about bitcoin price in 2018.