Nothing good can be achieved without holding in the long term. If you do something in the short term, it becomes trading. If you do something in the short term, you cannot gain much from it. If I have done these or am still doing some things, from my own analysis, I can see that if you do something in the short term, you cannot expect anything good from it. However, some profits can be achieved but not much can be expected.
If you can maintain DCA and invest in the long term with understanding, then it is best. It is true that to get something good, you must have the mentality of holding for a long time.
I agree with DCA. But don't discredit the traders that are able to make sums of money. There's also good things comes in there.
But it just so happen that the majority who trades get rekt and that's a fact but don't forget that those traders that makes a lot of money, gets to the top as well. I'm a long term holder and I know that in fact that DCAing and long term holding is very effective. However, if see someone who makes a lot from short term trading and strategies, you cannot invalidate that strategy works for them but not for us.