I would put only 10%, because nothing is for sure in crypto, if bitcoin can go up or go down, so if you want to safe your money I don't think you should put all in it. You can't be sure if someday bitcoin may drop considerably in price.
nothing sure , but bitcoin have teach us how sure it is ,
when the price of bitcoin $2 only , few people trust nothing to bitcoin ,
until bitcoin proven itself by go up extremely to 3,000% ,
you should learn from it , and put nothing doubt in bitcoin , invest as much as you can.
You have a point though and no one expects for bitcoin to rise up like these. How much more if you bought bitcoin in just 0.70$ then for sure you would have no idea if it rises in the future. Same on the situation of us ,as of now we would still feel the same thing which a little bit hindrance to invest more in bitcoins and thinking that it wont rise like before back on previous years.