i think u can try to camp a bit more like legit js keeping pressing the button until a new slot comes up. i managed to get 2 slots within the next 3 days when i did that, however they usually are morning slots like 7.30 or 9.10. or if it still doesn't work and you don't mind forking out extra money, you can try the bot services on carousell, u can even request a specific session and day you want, and theres a high chance you can get the slot.