There are some factors that need to Notice before Investment on any Altcoins.
Market cap of that Coin
24h volume of that coin.
Maximum supply of coin
Blockchain Technology that Coin is using.
Globalization
Community behind that Altcoin
Whitepaper
Liquidity
If I missed anything then include this in this Topic
You are forgetting about the transparency of the development progress, because that gives regular information about the development process of the project itself. As you can see many projects are not making any regular update to the investors and i called that about less on the transparency and that makes a lot of investors doubt about the future of project itself.