Waiting to feel motivated is like waiting to feel like doing laundry. It never comes. Start the wash.

Motivation is usually a product of starting rather than a requirement for it. The feeling you are waiting for tends to arrive a few minutes into the task, generated by the motion itself, so waiting for it first puts the two in the wrong order. Routine chores in particular never produce enthusiasm in advance.

Pick the smallest possible entry point, two minutes of it, and begin without consulting how you feel. Let willingness catch up while you are already moving. Most of what you are avoiding gets easier the moment it is underway.