For investors who invest long term buying bitcoin is the most profitable. However, for short-term investors who already have strong trading skills, they can take advantage of the momentum of the ups and downs of Altcoin prices that have strong fundamentals. They buy Altcoins when they are down and then sell them when the price is high so that the profits can be maximized.
Altcoin price action mostly co-relate with Bitcoin movement. Bitcoin price is trading over 39k, and this price is not confirmed whether go upside or downside. For investors who invest long term can be saved but short term can give negative result. Many market analyst trust that the bottom isn't over but Bitcoin price could see more downside between 30-35k. Those dealing you've warned.