Dividing your investment into 3 and invest one part of it into Bitcoin is very wrong and it is not advisable to do that, what is advisable to use for our Bitcoin investment is 5-10 percent of our income depending because some persons have several source of income and so they can decide to use more than 10 percent from one of their source of income to invest. This 5-10 percent I'm talking about should be what one can be able to let go because Bitcoin investment is a long term investment that is if you actually want to get a good result or outcome from your investment because if you hold for long, your output will always be greater than your input.
If not for the fate that it is be better more to be a low coiner than to be a no coiner allocating only 5-10% of your income to invest in Bitcoin is too poor for me it is assume that you are scared to invest in bitcoin.
Bitcoin is not shitcoins if it's shitcoins you want to invest then i will advise to only use 5-10 % of your income since they are not to be trusted for there is possiblity that it can dump to nothing but i don't believe that Bitcoin can go to zero or even go below 60$.