My only advice: Don't stick too long with one coin.
If it reach your take profit line, be happy and sell it.
I have seen many cool projects that I hope I can buy and hold them forever like SC, STRAT, BTS, NEO... but no. I end up selling them after a massive dump.
As much as I want to buy into that, I am not sure I can. If you believe a coin have prospect, I see no reason why you should not hold on to them for as long as you can. Moreover, what made you consider those coins you just mentioned as cool project is because you have seen so much development, most especially with the increase in value rate in a short period.
However, this does not mean there are some other coins with prospects and as long as you can do your research and buy at a very good price, holding should not be a problem.