Hello everybody, Bacteria here.
I created a new account just for reviews, but I don't have ideas for reviews.
Can you help me?

You could start by reviewing other projects. Like animations, games, artwork, etc.
I would ask permission to use the project in a review though.
It also doesn't entirely have to be just reviewing projects. You could review features on the Scratch website.
It doesn't have to be just things in Scratch either. You could review things outside of Scratch like movies, video games, TV shows, books, etc.
Those are just some suggestions, but you could do something else too.
Hopefully this helps you get thinking of ideas.