If I'm correct, it's almost the same thing with bitcoin? It reached 0.01$ once but since then, its price is decreasing.
Doge coin is a zombie coin without active development progress and people are still using it as a cheap coin to be used to create a small tx with very low fees.
The price is decreasing a lot caused by people aware if they need the use-case from the coin that's sad to see the doge dev has already retired from a long time ago to develop doge.