Currently the price of bitcoin is still very low if compared to prices at the end of 2017, Bitcoin has decreased by approximately 150%, while Ethereum is currently experiencing a price reduction of approximately 500% from the highest price at the end of 2017. If only I were you then I would buy Eth with 5 BTC, I am sure this would get a bigger advantage than just holding BTC. while 2 more BTC I will trade by buying other altcoins.