I hate it what you did with your instant book, the biggest problem is that guest don't recognize this feature is turned on by default!!! And here you make huge mistake. If someone want find something in my city next week he loose 45 listings instead of 56 he see 11!!!
Who on earth like this??? Guest see for couple seconds and head over to booking.com with much bigger choice. Because options are less and prices of course high sometimes in desired area close to beach with instant booking is nothing to be found!!! but if you turn it off there are plenty options which now 90% guests simply dont see!!!
From computer at least there is small notification that instant booking is on but still people dont recognize it, BUT THE WORST IS mobile application it's completely hidden under filters and guests have no way to know instant booking is on (and these days most people use mobile app to book) . I have spoken to hosts when I traveled and they say this year is much worse as previous. Hosts are upset they have less clients and guets they have less choice. If someone wnat instant book you have notification about it so what is problem? when someone send request he also get information of instant book feature so what is your problem?
I even did experiment I put my room 10EUR one night like morning for current day nobody booked when everything else in city was 20+EUR and my was next to beach in central spot, in booking.com it would get 100s of bookings for this price!!! You dont have traffic.... people are turning away.