My investment strategy is buying and holding. I feel that day trading is time consuming and stressful as well. I agree that some coins prices fall after ICO but not all projects. That is why we have to research carefully before investing. Solid projects are still worth investing in.
I only tried day trading once and the migraine I had for that day is something I have never had in my life, so I just decided to switch to following of trends and trading based on some analysis and to me that seems to make more sense. However, holding some of these coins from the trading that I do is one investment strategy that has really paid me a lot and I believe would even pay me more in the future.
My strategy is to always look for good projects and then hold as many as I can most especially when I have the chance to buy most of them at dips.
With this, there is always going to be a guarantee of having good profit on these coins in the long run rather than putting all my eggs in one basket. This has really helped me over the years as a lot of these coins have really made some pretty good profit and I believe they will keep making those huge profits in the long run.