First of all , check the whitepaper , dev team , roadmap after that you can worry about marketcaps and so on . the marketcap ,,, if you invest in 1 coin in the top 100-200 you'll rarely get high profits . I like searching for gems under 10M marketcap . Another aspect are the events that follow for one particular coin on coinmarketcalendar , i like picking mainnet realeases , token spaws , token/coin burn , airdrops and so on .
You can make easy money in crypto, you just need to invest time and knowledge .