Bitcoin is hard to predict and anyone able to pull out profit by day trading, well kudos to you. I rather hold altcoins than challenge BTC.
All crypto currencies are hard to predict their movements correctly. Sometimes bitcoin gives more profits than altcoins, and vice versa. I don't think you should only own altcoins all the time, at some good days, you should take profits with your altcoins and change to own bitcoin and wait for chances to buy altcoins back in later days.