American married to a Japanese. $2.5M NW. What is the best way to maximize exchange rates?

Spouse is Japanese citizen and I am a 52 year old US citizen. My NW is 2.5 million ($1.4M Trad IRA, $120k ROTH, $310k brokerage, own a home in US worth $600k with about $80k left on loan).

We live in US. I earn US dollars in a remote role. We have e plans to move to Japan in 3 years with me keeping my remote role. How might I financially maximize this situation and avoid unnecessary expenses I.e. taxes)?

by SickMon_Fraud