Any type of investment has its risk and anything that is profitable isn't 100% safe. However, having enough knowledge in the risky world of crypto investment has an advantage for you will be able to know what's legit and what's not. Instability is one of the characteristics of cryptocurrency but holding reputable coins and investing with coins with a good foundation is an edge.
I always avoid anything inform any investment with huge returns is a no for me. It's good thing to risk and its good thing to invest but doimg this with greed is a signal that should be strongly avoid, they will not only damage your capital, you are at the risk of losing it all in the handa of scammers.
I know that it's hard to hold Altcoins and bitcoin but if you manage to hodl and get caught in bull run, the rewards are always too much to believe they are real. Hold if you must, trade and s all at every opportunity, crypto is always here and will be here for this who believe for it is safe haven.
Just HOLD when you can afford to do it, in fact, nobody urges us to do that. People will think that by simply holding we will become profitable, yes it might as long as we are holding the right coins like BTC. Apart from that, sometimes we are holding for nothing like having these shitcoins which some people do while hoping it gains market value someday.
@OP, if you can do both, having a job and investment, you are making yourself too easy and have a better future. Don't ever neglect that as an investment is for the long-term while having a job, I consider it short-term.