I think demands for buying bitcoins will increase after Bitcoin SegWit Activation August 1 and solving the problems such as transaction times and this will cause the price to rise. So now it's a good time to buy bitcoin.
About converting your bitcoins to altcoins I should say that converting some amounts of your bitcoins to coins such as Litecoin and Ethereum might be a good choice. They worth it. They have the potential to rise more than bitcoin however it is difficult to predict. Forget about waves and ripple.
Thanks. As for the first time i am going to invest small amount as $50. That is why i thought about cheap alt coins.