Make an Actor blueprint. In there Setup the trigger box (box collision). Add to the box a on overlap Event. Right click and get the Player Controller. From that Controller pull a node and search for enable Input.
Use or “Use” Action Event (that key you assigned a Input Action) and call open Level. That’s it.
You can promote a variable from the levelinput and make it visible. So you can place your actor and can then Setup every Level you have (in the Editor Details tab from the actor)