1. Buy altcoins that have real use cases or backed with real wprking product, they tend to always have value better than copied projects.
2. Take it or leave it, new good projects will bring better ROI than many old altcoins, feels like we've seem how far old altcoins can go already, now its new altcoins time.
About your first point, the real use case becomes the main thing that has been searching by so many people but again, not all of the altcoins have a working product. Some of them have products, but the problem is also their products not working to generate revenue. In the crypto market, the price will be determined by HYPE and FOMO.
Again about your second point, old altcoin still has the best ROI compared with new altcoins. Have you known that almost 90% of new altcoins are a scam? Remember about those new altcoins which are getting huge ROI already decreased again to the ICO price. I thought that your second point is not suitable with the current situation of crypto.