I signed and now I cant download my songs back from my iCloud

There is no way to reverse this.

You can only change Apple IDs for certain iTunes purposes on your device every 90 days.

See >>> https://support.apple.com/en-us/HT204074

You did something from this list, which triggers the 90 timeout.

Click here and ask the iTunes Store staff for assistance. This restriction is part of the copyright protection on iTunes Store content and can't be removed from your end.

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