It is too difficult to choose one coin to next gem coin. Every new projects claim that our coins go to the 100x and 1000x. But it is only trick to attract the investors. So first you can do your research and then invest in these coins
As long as you can consider some factors like tokenomic, partnership and product. it would be so easy to pick some that have big potential to growth in the future. I meant in this case there are so many tokens are really worth to invest.
People will not able to make hundreds times of return until they will be picking the new legit project that has not yet traded in the market.