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If your mod in the Workshop is not being published and is taking too long, don't worry, I will teach you how to solve this.
First, make sure that your mod's logo.png is BELOW 1MB, if it is above that, try to adjust its size, the correct resolution is 1024x1024.
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If this doesn't work and there is a file called "id.txt" and you haven't published your mod yet, delete it and publish immediately, the file is only needed to update your mod in the Workshop!
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If that doesn't work either, look in the "mod.txt" file, and if there is a description or a "changeNote" that is too long, try renaming it to just "Test", this was the solution I managed to do.