It looks like selling your crypto for money when they are profitable is more safer than holding them for long, my point is only very few coins are worth holding for many years, if you still doubt about this go on coinmarketcap and look at most coins that came into this world in 2018 many of them have no volume again, the shocking one to me is gowithmi, a project that my elder brother praised so much at the time but today it's volume is not up to 50k, many projects will face same fate, be smart
I know that there are a lot of bitcoin enthusiasts out there and also here in this forum who are saying that very cryptocurrency except bitcoin is basically a shit-coin. I don't really agree with such statements as i think that even new and upcoming projects can be very worthwhile to invest and to hold for a long time. Of course if you invest in such new projects the risk of losing all your money is way way higher in comparison to an investment into BTC so the first promise should always be to only invest money that you can afford to lose and to not invest into meme-coins of course because 99% of them will be dead in a few months.