If you're not sure if your site has been penalized by Google, follow these instructions:
First, try using the Google Search Console to check for any manual actions that have been taken against your site. If you don't see any manual actions listed, then you can use the ""Fetch as Google"" tool to see if there are any issues with your site that are preventing it from being indexed by Google.
If you still can't figure out why your site isn't ranking well, then you can submit a reconsideration request to Google. In your request, be sure to include information about the changes you've made to your site and how you've addressed the issues that were causing it to rank poorly.