How do I make my stamina bar go back up?

It goes back up when I release shift, but only once. Is there a way to make it go back up completely once I release shift?

On shift released, set stamina to max value

Here's the programming, I've tried a few things, of course, I can make it instantly go back up, but I'd like it to slowly go back up when the shift key isn't pressed or when the player isn't moving.

I think the problem is that "On key release" is a trigger, you can tell by the little green arrow next to it.

Triggers are only executed when they actually happen, in this case when the key is released. This is in contrast to regular conditions, like "Key is down", which are checked continually.

In your case you can use an inverted "Key is down" event. This will continually check if the chosen key is NOT pressed. Then you can do what you need while the key is not pressed.

Works perfectly! Thank you!

Here it is for anyone who needs help!: