Checking a website, Google Merchant Center account, and trust signals is a big task. Most merchants that post this specific question have in most cases not read all policies or have read it partially. Please note that you are required to have read all policies.
Once you have read all policies below, please ask specific questions and we are happy to guide you.
I recommend having a look at the following policies:
Follow the Merchant Center guidelines: https://support.google.com/merchants/answer/6363310
Make sure to read all linked and referenced policies.
Everything mentioned below is referenced in the above documentation. However, these are the second most important policies that you need to comply.
Follow the data feed requirements: https://support.google.com/merchants/answer/7052112
Read all attribute policies
Common issues are not complying with landing page requirements: https://support.google.com/merchants/answer/4752265
Make sure what you sell is allowed: https://support.google.com/merchants/answer/6149970
Check that your checkout complies: https://support.google.com/merchants/answer/9158778
That you have added the below pages and linked in the footer of all pages:
refund page
returns page
delivery/shipping page
payment policy
privacy policy
terms and conditions
disclaimer
Reference: https://support.google.com/merchants/answer/4752265
Make sure you do not sell face mask or PPE
Reference: https://support.google.com/adspolicy/answer/6015406#:~:text=Sensitive%20events
For update info: https://support.google.com/google-ads/answer/9811449
Make sure you do not copy-paste images or text from other sites.
Don’t have multiple websites in the same niche
Make sure you don’t have multiple disapproved websites or accounts, this is called circumventing policy violation.
Reference: https://support.google.com/adspolicy/answer/6020954
You have a track record of order fulfillment, for example, honest reviews.
You can ask Google for specific examples of policy violations. To do so ask here and check the box, I need more info: https://support.google.com/merchants/contact/suspended
Hope this helps.