Show yourself (and others, if you like) how much you have learned!
Here are just a few ideas I encourage students to try:
The best way to learn is to teach:
Teach a parent or sibling the current skill you are working on with the violin.
Mock audition
Play a section of a piece for a small audience and ask for constructive criticism
Masterclass
Have a lesson while other students watch and learn while you learn.
Become a violin influencer (for pretend!)
Make an instructional video to explain a concept you have recently mastered.