In general, what he did in the past has proven to be successful, but for now it doesn't necessarily have the same opportunity, because many conditions that affect the current situation it is impossible for Elon Musk to do it again, moreover the market conditions at the end of the year are not so normal, so to achieve what he want to have a difficulty level.
In order to repeat such a trick with a Dodge coin, it will take some time, which is called correction. Obviously, such a time for pumps has not yet come, which is why the market reacted so relatively weakly to Elon Musk's last post, in which he announced the possible sale of merch for a Doge coin. Although 30% in a few minutes is also a good result of shill.