I think one of the keys to lowering the b6 levels is drinking a lot of water and stop taking all supplements with b6. Here are a few more references that I hope can help you.

--- How to Lower B6: https://www.livestrong.com/article/522968-how-to-lower-b6/
--- Vitamin B6 Toxicity: http://www.easy-immune-health.com/vitamin-b6-toxicity.html
--- Understanding B6 Toxicity: https://understandingb6toxicity.com/

@landersen804 started another discussion on how to lower b6 levels and may also have some suggestions or experience to share with you.