@Valentina352Could it be due to your long stay discount? Not knowing how much you want to charge, it's difficult to see what's going on.
I do see that you've already cancelled a reservation. Cancelling a reservation is never a good idea: as you probably already know, it carries some penalties, including not being able to get Superhost for a year.
Once the reservation has been accepted, you can't change the price to a higher amount. You need to get your listing set up properly before going live. If you're having issues, you may wish to block your calendar until you get it sorted out.