If someone bought the Dogecoin at the highest price, then it is better to wait or change it to other cryptos and make money by exchanges and swap?
I think it is better to hold till the altcoin season or till the next pump. I predict Doge still has a chance to increase again. Now, people are focusing on SHIB because this meme token is increasing very crazy. People may move to Dogecoin again when SHIB begins the next correction. Just wait SHIB hype is over, people will move to Dogecoin that is basically a bit better than SHIB.
But why keep holding the coin? You can do all of that while you sell your dogecoin and hold bitcoin instead, then when SHIB begins to go down as people lose the excitement they had over the coin and they begin to invest in dogecoin as you are predicting then you can do the same and still obtain most of the benefits of this upward movement of dogecoin without any of the risks, because in the case dogecoin drops and your prediction is wrong you are still holding bitcoin and you are protected from that crash.