Accidentally reverted check in. Lost my whole map

I have a zone wars map and sometimes when I go on it previous updates and new updates merge together. So like everything that I built in the last update, would suddenly appear in my map overriding. But this time the update was really big so I didn’t want to delete everything. So I activated check in, but it seems I haven’t checked in a long time because it reverted to an very old version of my map. Now I’m looking to revert back to the current version but when the updates we’re not overriding. For example my last private island code that I published for my map. I’ve tried accessing windows powershell but didn’t find my save there. Please help me I can’t lose my map!

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