Holding can be a good way to make a profit in the future but that will need more observation about what coin we should hold. It is clear that holding bitcoin, ethereum and bnb can be a good way of holding the coin, but do not forget that altcoin will always be behind bitcoin, so you need to buy at a low price to prevent the dump that can happen to the market. But if you can not buy at a low price, you can just buy at a low price and hold it but always manage your emotion, especially if you always check the market price.
Look, I'm a holder here so I can't speak enough about how good it is as a strategy, including with DCA regularly, you can keep a day job, do your life as normal and enjoy the best of both worlds (be a regular guy not spending all your time in crypto but still reaping the benefits of crypto).
But this applies only to BTC and maybe ETH, and a select few coins. Everything else is a big, big gamble.