Q.I Have Fruitless Mulberry Tree For 8 Years Has Not Grown At All
How can I get it to grow

Certified GKH Gardening Expert
This article describes the growth of a fruitless mulberry - you didn't mention how tall the tree is at this time.
https://ucanr.edu/sites/urbanhort/files/80182.pdf
Your tree may also need some pruning. Here's some info about that:
https://www.gardeningknowhow.com/ornamental/trees/fruitless-mulberry/how-to-prune-a-mulberry-tree.htm
https://aces.nmsu.edu/ces/yard/2001/012701.html#:~:text=You%20can%20prune%20your%20fruitless,before%20the%20buds%20finally%20open.
The only other things that come to mind are, if it has no diseases, your soil may be insufficient in nutrients, or the tree may not get enough water or sun. If you find all the growing conditions to be satisfactory, it would be a good idea to conduct a soil sample to see what is missing from the soil.
Review the trees optimal growing conditions here: https://www.gardeningknowhow.com/ornamental/trees/fruitless-mulberry/fruitless-mulberry-trees.htm