That was literally the only reason why it went up, it had no other reason than that. So, when you think about it realistically, it means that unless Elon Musk talks about it, we are going to see it not go up again, ever. So anyone who buys dogecoin since then, and from now on, will only be buying something that can profit them only if Elon Musk tweets about it, that's it.
If you think that Elon Musk will tweet about it and make it go up, then you should go ahead and buy it and hold until he does. If you think that it is a stupid move to invest into something that depends on someone to tweet about it, which I do, then you should stay away from it, which I do. That is a very simple mathematics, nothing complicated about it.