If you are confused about what altcoin to invest, then I suggest you to choose altcoin that is in the top 10, because of course it is safe and will definitely give you a profit when the bull run occurs, but if you want to get a big profit, then you can invest in BLZ, ARPA and CTSI, but of course I still recommend you to "DYOR", because it's not good to trust 100% of people's recommendations when you invest in cryptocurrency.