BTC investment is the best investment you can invest to make a good profits during the bull season because, whenever the price is pumping in the market make investors to earn from their different investment either long term investment or short term investment.
If you are talking about newbies in the BTC investment, they always fall victim to sell their BTC in the low price because they always conclude that the price will not pump above that particular price that will make them to run to the market to sell and begin to see the price continue pumping in the market because, they didn't exercise patience in their hodling.
Yes that's the risk of being a careless beginner, as a beginner they should prefer to learn to explore it first before trading in the market. Otherwise events like what you said will repeat and continue to repeat.
But most of them start out unprepared and worry that they might miss out on some amazing momentum. Unfortunately, they made the wrong decision because they missed the momentum and ended up making a loss because the market was expected to go up and in reality the market went down and they sold at the wrong time.