1. Upgrade Magento CE to latest version,
2. Install latest security patches.
3. Move the Magento backend (admin) page URL to some random for more security.
4. Fixing the multiple version of jQuery on the site which is affecting the load time.
5. Fix any other errors..
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May I request you to please provide me URL of your existing website? Look forward to hearing from you & start further discussion thru' private chat. Regards, YK LEADconcept