My advice is to invest in bitcoin, you can invest 50% on it, and 50% more on other altcoins like eth, ada, neo, xlm, or coin you think that gives potential in the future.
I agree, a good spread but also a sound investment in the most secure and fully established cryptocurrency. Stay away from cheap altcoins (very few offer nothing other than the dream of being pumped and mooning) those days are gone (hopefully anyway)