What is the fair percentage of a total max supply that are in circulation that can make you invest in a project? It is fine to avoid a project that has low circulating supply? Why? What about if the project is a brand new project and the use case is killing it?
Not sure. But I can tell you that any circulating supply above the "millions" is totally not worth it. That's if you're looking into coins that're ideal as a store of value. Cryptocurrencies such as Bitcoin, Litecoin, and Dash all have an extremely-limited circulating supply. The max supply is also lower compared to other coins being traded on the market today. You can invest into them now, and obtain huge returns in the future (especially Bitcoin). I cannot say the same about Ethereum, Cardano, BNB, and the likes. These have large circulating supplies, making them useful only as digital cash. Depending on your needs, will be the type of coin to choose. Be advised that just because a coin has a large circulating supply, doesn't mean it's destined to failure. It's all about how active the coin is in terms of development and innovation, and what use cases it provides to the world. As long as you play your cards right, you'll be able to avoid losing it all further down the road. Who knows which altcoins will be able to stand the test of time? Just my thoughts
Other coins that you named are good for an asset use because of their huge supply and we can see that their growth rates are very slow. If there is an altcoin that can last long like BTC, that would definitely be ETH.