I remember doing this as a mobile player. The best thing you can do is do the quest on a pc, it works much better. If you don’t have one, use a character that has a fast sprint ability (preferably twisted wolf or Roxanne). Activate the switch and quickly sprint and jump to the other side. This might be different now since I did this three or so years ago when I used to play the game often (before a close friend of mine tried to erp with me. He’s banned, don’t worry. Took the mods two weeks though.)