Product Page Update Dilemma

I am a freelance SEO and am looking to update a product page for my client which compared to all their other product pages, gets a lot more organic traffic.

This is good although the page is terrible in terms of SEO (too long, terrible user experience and flow compared to other competitors). As far as I am concerned, the only thing "SEO-related" thing my client did for the page was spam in keywords related to dropshipping wherever possible.

They have told me that the page is good as it is. Should I push for the page to be changed or is this a lost cause? If anybody has any similar experiences with clients that would be great.

Thanks