I did similar back in 2019, I was watching an end of August Med cruise on Britannia. (Back early September so not school holidays) Balconies starting at £1049. So much availability was sure there would be another price drop. Nope turned to Sold Out overnight. Of course by then I had convinced myself I needed to be on that cruise, kept checking for cancellations, one popped up about 10 days before sailing, In short, we ended up paying £1400 each for an Inside 🤣 Had a fab cruise though.
we usually book Select, but booked the 7th July as a little extra, our preferred rooms already gone, so opted to try the saver fare. Got exactly what we paid for, grade wise, 3 cabins away from where we would have chosen on Select but around a corner, so No Aft view for us.