Bot won't move on ANY axis

My bot (Express XL v1.1) struggles, but fails to move on any axis. Even the Z axis which came pre-build won’t budge!! I feel like none of the motors are strong enough to move the device. I’ve tried tightening / loosening the belts, tightening structural screws.

Any advice?! I’ve follow the standard how-to’s and nothing seems to get this thing moving. I’m hoping anyone here can provide me with some insight or “secret” techniques.

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