But do not invest your all money to btc , only invest what you can afford to loose. Do not put all the eggs to one bucket , diversify it. if you have 100$
50% put to btc others to alt coins.
if you believe that the price of BTC will increase very high as the price you predict, then why should you be afraid to invest all your money in BTC, because in my opinion investing in BTC is safer and will definitely give you profit compared to you investing in other altcoin, so in my opinion you don't need to be afraid for invest all the money you have in BTC, because investing in BTC will definitely give you profit.