Investments shouldnt be based on predictions,you should be doing your part which is researching so you could easily identify shitcoins or scam projects from the few good projects out there,the market has been raped by these scam coins which has no use in our lives.You need to eliminate these projects from your path,do not rely to people's suggestions,learn technical analysis and fundamentals because these two factors would give you more confirmation about a good and scam projects.
You are right,relying to other's was never a good idea,self study and doing a lot of research will give you the best idea in which of these shitcoins would give you millions of dollars we just need to spent some time reading to each coin's whitepapers either it is new or old coin just to be familiarize with the market's nature.