500,000 cell limit - reactivation of sheet/ form after I delete columns

Our whole operation has ground to a halt as the cell limit of 500,000 has been hit. I reduced the number of columns such that the total amount of cells is now well under 500,000. Yet the sheet and form attached still remains inactive.

How do I reactivate?

Thanks for any assistance from the Smartsheet community.

Rgds,

Dave

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