Anyone who wants to see Doge on the moon needs to keep mining it, purchasing it, and using it. That doesn't mean trading for BTC or USD. But use it so others who use Dogecoin can earn some too.
The only way Dogecoin is going to grow to its full potential is if people who hold a good share of it will spend a portion of it. I think we need to spend a percentage of our holdings over the next 2 years in order to rapidly increase circulation into a huge market.
Dogecoin spending should be dedicated to infrastructure developers, community tips, award giveaways and the purchasing of goods & services.
If everyone only holds their Dogecoin without a little real usage then it has less purpose which = less value.
Too much hoarding is not a healthy savings.
The key is to spend little and then earn even more. Spend + Earn = Moon.

Just today I bought a graphics card to start mining seriously instead of the pathetic hash rate of my CPU.
I agree that value in a coin is when it is actively used, but the exchange does not agree with that.
The value on an exchange is only set by the question: does someone want to invest value in the coin?
Does not matter if that is USD or other valuables, but the Market Cap is really a good name: the value
that the people who are buying the coin are thinking that it has.
So, as long as more people want to have the coin than letting it go, it will increase on the exchange.
Part of that is an expectation of value increase, of course - the same reason people buy gold or company stock.
You are right that a coin should be used - that way, more people get to know it, it is seen as a good currency and
therefore the perceived value will increase. Which will make more people want to buy it... To the moon!