Disappointment on 472kHz WSPR

Overnight I was on 472kHz WSPR, but only a couple of stations spotted my 10mW ERP this time. On RX, I again spotted Italy and Norway. Perhaps the rising noise floor is clobbering my little signal? Or is the novelty wearing off and there are fewer stations? Often according to WSPRnet there are very few UK stations on TX on 472kHz.