Japanese-Canadian looking to switch things up!

Here is my story..

I was born in Osaka and moved to Canada when I was 5.

Having spent 25 years in Canada I am now 30 years old feeling a bit too comfortable with life and want to experience more, especially reconnecting with my roots.

Having gone back a few times to Tokyo, the idea of moving here has really grown on me.

Here is the issue…

To my knowledge, I have a Japanese passport (expired) and haven’t been asked to make a decision to renounce citizenship.

I have been a Canadian citizen for many years and I’d ideally like to somehow have dual. I am approaching my birthday so I will likely be unable to apply for the working holiday visa.

How should I navigate this and is there anyone else here in a similar situation?

To note, my Japanese communication skills are fairly good, I can converse daily well and hold conversation but when it comes to more complicated topics like politics or sciences I am definitely lost. I can hardly read or write either..

Any thoughts??

Thanks everyone!