Hello @The-Dans0
Unfortunately it sounds like you let your listing go live, before you were familiar with how Airbnb works.
Do have a look at their help forum. Airbnb takes host cancellations seriously and penalises hosts who do this, as you have found out.
You can give them a call or use their social media to ask them to review the penalties, but they do expect you as a host to make sure you have set your listing up properly including minimum stay requirements.
I would suggest you turn off instant book until you are more familiar with how the site works.,