Where to invest?
Any ICO
You can check in market cap if you want to invest your bitcoin into alternative coin but be carefull to a scam investment you should ask first if the coin you want to invest is trusted. but investment is a long term to hold altcoins its too risky. if you want you can hold your bitcoin and wait for increasing the price..
If you have zero knowledge about trading with altcoins or don't know any of it better to hold that bitcoin since its too risky to invest into other things that you don't know, just keep on learning and then later on invest some of your bitcoin into good altcoins.