the first is the project product, the development of coin prices, how active the developer is in auditing the project, how much coin supply is sold in the market, the team always contributes to their group channel and arranges financial management for several other crypto investments or doesn't just focus on investing 1 coin .
For me, choosing altcoin that I first noticed is the average daily transaction, if you have a large daily transaction, it means that the token or coin is in demand by many people and has a prospective product. In addition, in choosing altcoin, I will see whether the coins are traded in many large exchangers
not only that, especially with altcoin ICO we have to see how their tokens grow and look even into their internal team
for me if they are active and have news every week or even month, I will choose the token to invest.