me and my friend are trying to speedrun the game but we keep spawning at the wrong spawn point and im just wondering if we could make our life easier by changing the files to spawn at the mountain everytime ?

There is no fix for this but every time you restart your game it will spawn somewhere else

Due to the nature on how we time this, no. If you want to force it to spawn mountain on every new game, just do this:

Get mountain spawn, restart game until you do. Save a file here.

Everytime you relaunch the game, load that save file first, then all future new games until you restart the game again, should be mountain spawn.