How to delay the visa process

Hi, I had applied SC 189 on July 2017, and had last CO contact on November 2017. Grant estimator is showing that, on the worst case I will receive on Sep 2018. Is it possible to delay it more. As my company has given me an opportunity in the U.K recently and I don’t want to miss that. Or is it possible to push initial entry date 3 years later . Any immigration consultant in room, I would really appreciate your advice.