Hey there,
How are you doing? Alright, so I get the picture that you've around 250k pages on your platform but only 13k pages are being validated, and rest of them have issues in Search Console. I have carefully gone through the errors which you're facing and I am confident to resolve them!
I have been involved in the SEO industry for the last 6 years and can confidently say that I can make this project a 100% success for you. I've worked on all types of projects, in different industries like eCommerce, blogs, local industries and so on.
If you are interested in seeing my portfolio, please let me know and I will share a PDF document with you. For questions, I am always available. I am looking forward to your positive response.
Best Regards,
Talha