472kHz WSPR - fewer stations now?

Although I've been on 472kHz WSPR using the earth-electrode "antenna" for some months now, it is some time since I was spotted by a new station. I think the last was EI0CF and that was weeks ago. I am beginning to think the time is coming to "pull the plug" until the autumn. By then I really should try to improve my antenna and my ERP in that band. Maybe as the Es season is fast approaching I should QSY to 50MHz (6m) WSPR.