I made several altcoin choices to trade now, but some of them I hold until the middle of next year, hopefully it will be the best session for altcoin.
Altcoin season will not happen this year and we will have to wait a bit longer before this officially starts. Currently you should only invest in some of top 100 coins at Coinmarketcap because these are options that are expected to be very promising. Of course, you need to spend a lot of time researching and trusting that coin when choosing the long term.