A lot of altcoin come every day, so not easy to choose, but some time you may find good project to invest, but still on risk.
It's good to stick with altcoins as long as you have the potential ones and not those who definitely lose their value in time. I am also a good fan of altcoins since i made a huge profits with the last bull run and up to now, i am still expecting that altcoins season will still come. We just have to patiently wait for it. But i also won't deny that i am also into bitcoin right now and i always make sure that i have a good balance for bitcoin and altcoins in my portfolio.