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最近3-5年不準備回美國常住，是不是1年不回去自動視為放棄綠卡了？

-Because your reentry permit has been approved, technically your green card is still valid, but you still need to have the reentry permit in hand when you return to US.

如何操作最好，求建議！萬分感謝！

-If your green card is invalid due to your overstay outside US, your wife can sponsor you to apply for a new green card (do all over again). SB-1 visa does not applies to you.