The cryptocurrency market is very uncertain; you are going to sleep thinking that you are on your way to make a profit because the market looks good, only to wake up to a major shift in the market, and you are in a stressful situation if you're going to cut your losses or just HODL.
The cryptocurrency market is very volatile and uncertain so that making predictions on it is very difficult. Even predict next price movements of Bitcoin is hard, if expanding predictions to Ethereum, then other coins, it will become more challenging and more impossible to do well. In this market, predictions are challenging and not easy to make accurate ones, so if predicting for winning and getting money, it's risky.
With investment in this market, the safest choice is Bitcoin, if people use own money for investment, they can buy and hold bitcoins in their non custodial wallets. With other coins, risk is bigger and it's not recommended if they're newbies in this market, Bitcoin will be the only cryptocurrency they should buy and hold.