You may want to remove your close out if you want to re-open your availability after previously being closed.
Click on "Close Outs".
Click on "Exit" and go back to the main menu to "Publish".
Make sure that you publish your setup so that the changes you made can be sent through to all your channels.
It's always a good idea to check your availability online to make sure that you're open for bookings again.
Check your own website or booking form to see if you're open again. You should also check Booking.com, Expedia, AirBnB, etc. to see if you're open on their side as well.