Hi,
As I viewed your project description, I can fix the error 404 Codes, remove duplicate page, title; also resolve the redirection issue, and delete unused plugins as I’m having the expertise, so, it wouldn't take much time to execute the results.
Please have a look at my few websites work:
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Holding an experience of 7 years in UX designing though, I have work experience in HTML5, CSS3, Bootstrap, Material Design, Js, jQuery, Angular Js WordPress, Shopify, OpenCart development, etc.
I’d like to request you to reply back so that we can discuss your requirements in detail till then Stay awesome & let’s expand.
Thanks & Best Regards
Amit J.