A pic would be nice in order to help determine the ability of fixing it.
Judging by your description you have one of the fox "on ground" pools.
Likely, it's not that you lowered your water too much that caused the tear, more so, I'd guess your ground retained lots of moisture over the winter (milder weather), once frost did hit, the ground expanded more than normal due to the higher moisture content, this pushed up on your steel wall and separated the liner, once frost leaves, the soil and wall returned to their normal position.
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