For example, just following the trend in a cautious and discreet way will be enough to provide you with positive expectation of earning profits other than through luck alone. It is not a secret that statistically, the price has more chances to continue its action once the direction has been established, the fact which you can exploit to your advantage
Exactly.
There are always going to be fiat holding times (Oct - Dec 17 come to mind) when people are being stupid with buying. Just wait for that drop before buying more and you get so much more bitcoin for your dollar
Actually, this is not a good approach
Well, maybe, it is not a bad one either (let's call it so-so) as following the trend assumes buying long when the trend goes up and selling short when the trend goes down. In this manner, buying the dip is not a good idea as it is synonymous with catching falling knives simply because you don't know at the time whether it is a real bottom or a false one. You can know that only in hindsight
Following the trend once it is established doesn't guarantee you from losses (losses are to be dealt with via stop-losses as the term itself suggests), but you have this small advantage behind your back and support under your feet that will allow you to be right more often than not, and thus earn profits consistently. This is the Holy Grail of trading so much dreamed of and longed for