Such predictions can give anyone but it is not like that those website will give 100% guarantee but Bitcoin is top cryptocurrency and it's have many history to price goes skyrocket. Before holding in a centralize exchange you should buy a hardware wallet because Coinbase is a custodial wallet.
Totally agree with you that predictions are made by many people and experts but there is no guarantee, because cryptocurrency market is a volatile market, prices can go up and down here.Here any good news can take the market very high and any bad news can crash the market badly.However, in the cryptocurrency market, Bitcoin is the most trusted cryptocurrency.. it is fair to say that the price of Bitcoin in the cryptocurrency market may go up in the near future.Your suggestion is also correct to always keep your assets in your personal wallet.Well, there are many wallets to keep your assets but hard wallet is considered the best and safest.