If you look at the ardor graph in the lasth couple of months , you can see some random spikes, like huge sudden buyings
I think that the reason of this is that tomorrow they will launch their first important childchain. You can see the countdown here :
https://ardorplatform.org/This childchain is for buying/selling and investing in real estate. It was created by Max property group, a fund that owns hundred of millions in real estate. It has huge potential
Their token, MPG, will be at first available only on the ardor decentralized exchange, so i think that people , from tomorrow , will try to accumulate it there at low prices before it reaches some big exchange. Let's see how it goes

That's still speculation and even ardor's main chain doesn't have an important role to the economic activities and could we call this child chain will be a success? Honestly, i never saw any real usage from any blockchain project like this one and its purpose to create childchain.