I think that the long-term investment contains less risks than the every day trading but you need to take into account that you will have to wait for long until the price increases and you will be able to sell coins
Long-term investment has the same risk as trading because we will not know what will happen in the future. plus if there is a sudden need to sell assets, even though this is not the right time to sell. so before investing long term you have to think far because there are many things that will happen in the future that you don't know yet. at least you must have complete assets in the bank.