Recently, I saw a few Bitcoin and altcoin Price Prediction website like https://walletinvestor.com/forecast/ethereum-prediction and https://longforecast.com/ethereum-price-prediction-2018-2019-2020-2021-eth-to-usd

I'm working on a site and want to add this type of feature in it. Can you guys please suggest how are these sites doing it or how can I build a better tool?