Actually if we observe altcoins, most of them has been seen deep price or a little upper than it, so what i want to say is you can invest altcoins from a best price of them ever. Before invest them you should consider project that is usefull or not for humanity or market. Such as wanchain, ontology or fantom are such a future project.
On the other hand you can invest ico and ieo. As you know ieo is a new trend of the crypto, so you can think about it either. My suggestion about invest ico or ieo is check project, hard cap, circulating supply, advisior, team. There is an interesting project about mentioned above is tokenroll. Their hard cap less than 1 million usd, that is of course one of the most attractive thing. Project is decentrilized gambling platform so actually for me that is kindly interesting item.
As a result you are alone in the crypto world and do your own reserach.