Today we saw how one person was able to bring down the price of another meme by 40% - this is Buterin. And yes, today it happened with the SHIB coin, and it is likely that this could happen with the DOGE. So don't make big plans.
Yes, Dogecoin is not suitable for planning in the long term because if it declines to a very large extent it will take a long time to bounce back, this is why Dogecoin is always at risk of being held in the long term.