Every prediction will only be useful for a while, because everything that has happened in the market both in the past and at present is not based on predictions but is always based on demand and supply in the market, if there is a lot of demand, then prices will tend to rise and stay in the market good numbers.
Prediction should be made by observation. As you have said about the demand and supply. Dogecoin have unlimited supply. More than 5 billion dogecoins will be added with the total supply of dogecoins at each year. So, the demand won't be able to help dogecoin to increase in price largely. Dogecoin price to $20k is out of imagination. And everyone can observe it easily.