This could have been done in 2017. however, if it was sold in the first week of 2018, there would be a huge gain. it's too risky to do that right now. the future of altcoins is unknown. but it's hard to say for quality projects.
There are a lot of potential altcoins that can have a good run this year specially at the end of the year. You just have to look at the top then altcoins and I'm sure that you will have a good idea on which coin to invest right now and just hold on it for the next 6 months. Although the market has changed a lot because of so much regulations, we can still potentially earn money by going into altcoins. You don't need to look further as the top 10 coins will really do good this year.