UK Magento homeware e-commerce SEO audit / healthcheck and google ranking / conversion improvements NO SPAM

I am looking for an seo audit, website health check, advice and help improving Google rankings for We my UK base Magento homeware e-commerce store. I will only consider bids from bidders who have actually read this description, so please start your bid proposal text with the word "ecommerce". Any automatic bids will also be ignored as this website is full of reselling and spamming bidders that just waste peoples time. WHITEHAT only, anything remotely BLACKHAT will be ignored. I have my own onsite auditing scanner/software so am looking for more than just an automated scan and pdf report and a backlink link campaign from free accounts. I get offered these multiple times a week by spam emails. Please don't contact me if that is all you can offer. The SEO issue is I have seen a steady decline in organic Google traffic and sale conversions from google traffic and are asking for ideas on how to and assistance in improving google rankings back to or beyond where they were in the past with the aim to increase converions/sales. Concerns to start with: I have found an increase in websites hotlinking my images and back linking to me from spammy domains and the domain hasn't had any strong do follow backlinks in a few years. I have also moved our website to full https and want to confirm the redirects are set up for the best seo results. I have a target keyword profile and I am considering starting a second website selling the same products but under a different set of targetted keywords. These are just what I am aware of, please some less than perfect onsite seo which I am working on correcting. I may provide url on request via freelancer messenger.