If you still didn’t find anything that would interest you for your CAS Projects/Experiences, here is another idea. We thought about optimizing the watering process in the school’s greenhouse. There is an idea of creating watering system using plastic bottles. We are not limitting you with approaches towards that, so you can cover Creativity strand in addition to Service.
If you are interested, feel free to contact me via firstname.lastname@example.org
And some meme fillers to make this post less sterile.