Since Bitcoin is said to be the costliest of all in the crypto market the fluctuation in its price affects other coins
this is to say when the bitcoin price drops, every other coin drops in their market price so drastically that will be noticed easily making them attractive to buy following the fall
this method will enable one to gain more coins than expected, following the records most of these coins have gone high in time past when the bitcoin price went up so buying more when the price falls seems to be a great trick on acquiring much more coin than expected, this is to say the fall enables us to use less fiat to acquire more coins
will you advice other users to purchase weaker coins when the bitcoin price drops or buy the bitcoin itself?
Weaker coins have a very "unpleasant" feature: they may not rise in price or even "die". This makes them extremely risky compared to bitcoin (which is also NOT a very reliable investment asset from a traditional financial market perspective).
Are you suggesting selling bitcoin while holding it and using the money to buy weaker coins, which will likely rise in price more than bitcoin in the future? This gamble could be successful, or it could be unsuccessful. In my opinion, it's better to
go slow and invest in bitcoin. While this may not yield incredible returns, it also eliminates unnecessary risks. Therefore, I wouldn't recommend buying weak coins (i.e., doing something I wouldn't want to do myself).