I’ve got an issue with regarding to my prayer, as we know, prayer should be in a moderate speed, not rushing, however when I’m working I find it difficult to pray at that speed, and I have to shorten my prayer. But the problem is, how do I shorten my prayer but at the same time be accepted in front of Allah(S.W.T). Can you please tell another alternative of prayer that I can quickly fit in during my working hours?

You should not shorten prayers and do it as an acceptable speed. It could be Shaitan who is encouraging you to speed.
Say the istiadha and seek protection from Shaitan.