Is there a way to bypass API LEVEL Target on Unity 2017.4

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I cannot upload my game to googleplaystore, its says: your app currently targets API level 28 and must target at least API level 29.

Im asking if I can bypass this target api level in unity 2017.4 so I finally can upload it on the Playstore,
because my old plugin is not compatible to the new unity. and will take me months to migrate it.

I hope someone can help.
thanks in advance.

I had the same issue. This tutorial helped : How To Update Unity to Android API Level 29 (or Greater) - YouTube