Hi @Istifan0,
I'm not entirely sure if my advice will be effective, but it might open up new directions for you to explore. If not, my apologies for taking up your time:
Set the price for the entire year at a ridiculously high cost per night, let's say 10 times higher than your usual rate. This will effectively block out the entire year because nobody will pay that price.
Then, establish a rule for last-minute bookings two weeks in advance with a 90% discount.
Apply this rule for the entire year ahead.
That way, only people looking to book within the next two weeks will see the real price.
I didnt try it, I hope it will work.