I'm sorry to say but you have 99% chance of NOT getting your seat.

The econ is overbooked.
J9 C9 D9 I9 Y0 B0 H0 K0 M0 L0 V0 S0 N0 Q0
is what it's showing. If you held a Y or B fare, and if your travel agent has strong connection with CX sales office, you might have a chance. But with your M fare....

If you have compassionate reason, they might accomodate you.

OR, here's your best bet. Currently, the Business is Wide open. So, call CX and request an upgrade award to be booked onto the 8th flight. Yes, it does require u to have confirmed Yclass booking on the 8th, but they might accomodate you.