To be honest I'm not sure if that's even new. You may find you will likely be doing minor dares that millions have already done before? You may be able to grab the younger generation as an audience but anyone from 18 onwards may likely scroll past videos like this.
You would need to think about how your videos will be different from the rest? What about these dares will grab your audience and make them want to keep coming back?
You have a base for your channel. I'd say use this time to build upon it. Try and make it unique