Long-term investment in cryptocurrencies is now better, because so many coins have fallen to the bottom. This is a great opportunity to buy them. But I would advise you to buy only omnet from the top 100, the rest are likely to die. Here's a study that says why most altcoins will die
https://neironix.io/news/guides/can_bitcoin_force_altcoins_out_a_brief_analysis_of_the_current_situation