I recently faced a visa refusal

Hello everyone, I recently faced a visa refusal when trying to visit my fiance in Japan. It appears that her lack of income tax payment or her part-time job might be factors. We even consulted with an immigration lawyer who mentioned that even if she comes to my country and we get married, obtaining a spouse visa might still be an issue due to the same reasons. Has anyone encountered a similar situation or have advice on potential solutions? I'd greatly appreciate any insights or guidance you can provide. Thank you!

I hate this answer but to be perfectly honest you kind of answer your own question.

If the issue is a lack of tax payments and part time work, then the likely solution is for your wife to pay her taxes and find more stable, permanent employment.