Wanting more does not make you ungrateful. Sometimes it means wanting more truth, freedom, creativity or space to be yourself. The first act of courage is allowing yourself to admit it.
You do not need to see the entire path before you begin. Clarity often arrives after movement not before it. Start with one honest next step and allow the direction to emerge.
Your life may still look perfectly fine from the outside, yet something inside no longer feels settled. That restlessness is not necessarily ingratitude. It may be a sign that you are changing.