This is why knowledge is very crucial and important because we can't just choose a coin and trust on it, pretty sure the results would be negative. Almost everyone on this platform knows when to trade and when not to do, there's also few that didn't know when to buy.
Yes there is a lot of opportunities in this industry but it's a challenge to crack a few and make money or profits on it. My advice is buy if you think that it's already dipping in your own knowledge and hold it to make profits in the future and be comfortable with you. Cause you would know by now when to buy or sell.
I would not conclude that everyone knows when to buy or when to sell BTC, and this thread is not really about selling anyhow, it is about buying and attempting to accumulate BTC.,. and yes.. BTC.. we are not talking about shitcoins here.. so your reference to choosing a coin or "this industry" is vague.. we are talking about bitcoin.. not about various projects that might be all over the place in terms of various other possible considerations, especially in regards to their fundamentals..
Of course, I have continued to express a bit of a tension in regards to DCA (dollar cost averaging) being a better strategy than buying on the dip because it can be quite difficult to determine or establish how much of a dip is enough of a dip, so my assertion has been that if you are in any kind of accumulation stage for bitcoin to establish a system in which you are buying regularly and all the time, no matter the BTC price - at least until you reach your BTC accumulation goals (which you have to establish for yourself what those BTC accumulation targets are for you).
I am not against buying on dip as a way to supplement DCA as a strategy, even though I do believe that DCA tends to be a superior and more basic strategy, and buying on dip is a more advance strategy and still some folks can establish various systems to figure out how to buy on dips, but I will argue and deny that buying on dip comes natural to anyone. Buying on dips is a skill that needs to be learned and honed, even though some people might have better senses of how to employ such buying on dip systems than others...