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If you have Photoshop, it has some AI powered filters that are pretty amazing. One is specifically made to do what you are asking about.
Yes there is. You can find some mediocre free ones online
This is a pretty good video about restoration options.
https://youtu.be/NiMC5VInbp8
Check out the Topaz line of products. You'll have to pay (I think there's a trial though), but it does pretty amazing work