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* Has anyone here successfully recovered traffic by adding 301s almost a year later?
define successfully. if you mean ALL of your traffic, I doubt it’s even possible nowadays with AI taking a big bite. But yes, you can recover a lot of traffic, that’s the whole idea of 301
* Did Google still pass noticeable signals after that time, or was the effect minimal?
It depends. Your previous pages were more than just content to Google: they were an equation involving technical aspects and, most importantly, authority. If the links and mentions those pages earned still exist, then yes, you’ll recover a significant portion of your authority. Again, as in the previous answer, not all of it, but a good part. However, if most of those links have ‘gone down the drain,’ the effect will be negligible. That said, your original pages also inherited authority simply by being part of your domain (internal links, etc.), so restoring them will always be better than nothing
