I think one thing is for sure if someone is still loosing money in cryptocurrency investments, it's a lack of research upon doing what is and what's that throughout his investment. He doesn't know any single thing on what he's going to invest such that he only chooses coins or alts that he hopes it could give him a good profit in the future, then in the long run it cannot give him any profit and by that he tries another opportunity similar to that. Repeating cycle to lose for investment.
This is one of the main problems with those people that call themselves investors but that do not do any of the things true investors do, an investor that actually does his job knows beforehand if the asset in which they are investing has any chance of becoming profitable as they made an extensive reached about the projects in which they were interested, while most people never do anything like that and just hope they selected the right project which is a bad idea taking into account the number of projects that are scams in this market.
Some investors too easily believe in their own instinct so they jump easily into buying altcoins without even doing a good research first. This mostly ends up into losing. While other investors too also believe from the advices of others because that certain advice works for them but when you do it yourself, you still end up losing. This just means that the thing that might work for others might not work for you so better DYOR in everything we do.