Leaving Japan soon, should I transfer all my Yen to my TransferWise and wait for a better exchange rate?

Hello everyone,
I have about 5M Yen here.

My bank will probably freeze my account and regarding the cheap Yen rate, I would like to wait until it gets better, I hope.

So I am thinking about either taking all my Yen in cash back to my home country without changing them or putting everything on Wise for a future use.

We are limited to 10,000 euros though, after we need to declare and pay taxes, I think…

I still have money in my home country, so my Yen can wait.
Thank you for your advices!