Question Setting up a proper state machine

Hi everyone after watching lots of youtube and googling about 10,000 things I'm a little confused on state machines. On the code below, I am unsure how to break out of states and go into other states when it comes to my movement script.

If I initiate PlayerMovement() on my idle state to enable walking, it just switches to State.Moving then completely stops my character's ability to move.

Code (CSharp):

1.    
2. protected virtual void Update()
3.     {
4.         IframeAnimation();
5.         GatherMovementData();
6.  
7.         switch (state)
8.         {
9.             case State.Idle:
10.                 break;
11.  
12.             case State.Moving:
13.                 Dash();
14.                 ActivateAttack();
15.                 MovementAnimation();
16.                 break;
17.         }
18.  
19.     }

Code (CSharp):

1.     protected virtual void FixedUpdate()
2.     {
3.         switch (state)
4.         {
5.  
6.             case State.Moving:
7.             StartCoroutine(PlayerMovement());
8.                 break;
9.         }
10.     }

Code (CSharp):

1.     private IEnumerator PlayerMovement()
2.     {
3.         state = State.Moving;
4.  
5.         if (isAlive && !Input.GetKey(KeyCode.Space) && knockedBack == false)
6.         {
7.             rb.MovePosition(rb.position + movement * moveSpeed * Time.fixedDeltaTime);
8.         }
9.  
10.         if (!isAlive)
11.             yield return new WaitForSeconds(0f);
12.  
13.        
14.     }

 

bump

 

It might be helpful to examine how others have approached this problem. A github search pulled up:
https://github.com/minhhh/unity-fsm
https://github.com/thefuntastic/Unity3d-Finite-State-Machine
https://github.com/dubit/unity-fsm

They may be more abstract than the concrete AI behavior you want, so the task would be to imagine how your behaviors could fit into such a system. Hope that helps.