Saving tax on big lump sum (Foreigner)

Hello, I need some advice on how to avoid paying tax on a lump sum amount I am about to receive from my employer.
I will be receiving around 5M from my employer around the end of this year as a reward for my work related to IP(Intellectual Property).
With 20% tax deductions I’ll be paying around 1M.
Can anyone suggest me ways I can avoid paying large amount of tax. Thank you
Additional info:
– Currently on a 5 year work visa.
– No plans to return to my home country soon(might stay for another 2-3 years or more.)
– No investments made in Japan so far

Edit: Sorry for using the word AVOID. What I meant was, how can I get relaxation on the tax I’ll be paying. For example: Home loan, investments in Japanese securities, etc.

by Low-Town7771

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