How to fix plotted route in Mapbox, Unity?

I am trying to build a navigation application. I have my user location. Actually i was able to draw a route. My problem is here; I added to application relocate button. When the user presses this button, users returns to own location on the map, but the route is broken.

I have to fix the route on the map. How can i do that ?

In the first time i plotted the route, it is okay.

https://i.imgur.com/6ZkJGH9.jpg

When i clicked the relocate button,

https://i.imgur.com/cI4y8RC.jpg