Drivers license test booking system

I tried to book an appointment to get my drivers licenese converted but looks like they are fully booked for the rest of the year when i take a look at the schedule. Am I understanding that correctly? Is there another way to get an appointment?

https://www.keishicho-gto.metro.tokyo.lg.jp/keishicho-u/reserve/offerList_detail?tempSeq=445&accessFrom=offerList