We generally try not to be pushy with the upselling, but this clear cover is inexpensive and is just perfect for your A5 Midori notebook. Grab the pair and you have a notebook set that will really be an absolute joy.
It could be that your first couple months of this line-a-day journal are pretty similar ("still quarantined, played Animal Crossing, ordered delivery from Ramen Bowls") but maybe you'll emerge with a solid habit of documenting your life.