Hey that's a good idea for a challenge! Let us know if you're going to do it. Maybe it could become a community thing where lots of people could join and we can all support each other?
I agree that posting every day is a challenge as I also have a lot of other stuff going on in my life. I don't know how your sister manages to post such great stuff so often!
I like to spend time making my posts good, but I also think that maybe I just procrastinate and obsess over the details a little too much sometimes. I guess there's also the argument that if you practice posting often, then you get better at it and you can manage both high quality and frequent posting. This d-tube post from @axios about still posting every day even when he was travelling and had family commitments to take care of gave me some food for thought. He talks about flexing our creative muscles and I think it's true that the more you practise it, the better you get at creating.