Pls any gear or mechanical specialist in the house,I noticed a change in the movement of my car(Nissan altima)when the car is powerd on,and pushed to drive,i noticed he doesn't move like normal,instead moves like a snail,when I try to accelerate it moves and when the acceleration stops,it goes back crawling again.

Pls what do you think is wrong pls?
Pictures below of the ride

Immediately I checked the gear oil,and I found out,its gauge...I was relieved tho...pls help with your experience pls