I don’t have much experience with the new input system, but it looks like there’s no intuitive way to mimic the functionality of Input.GetKeyDown(). This is an issue, because using Input.GetKey() doesn’t work well with triggers; the 5-10 frames that you hold the button down causes the trigger to stay true.
If you really want to use triggers, take a look at this thread on how to detect a keypress for a single frame: How to implement " if(Input.GetKeyDown(KeyCode.A))" in new input system?