Google has deleted my Website from Search Results

Hello guys
i have a website offering Downloads of some sort. Google penalized my webstie and now it is not appearing in search results
not even searching like this
Site:www.example.com (it was a high ranking Download site)
I need to ask some questions
Q1 : if i will change my domain name will it work ? will it again start to appear in google

Q2: What can be done to get my site back again result?

Please kindly help me with your opinions Experts
i will be very thank Full to you.

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