Professional jewelry website, 1097 sessions, only 13 orders. HELP!

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Hello my website is A jewelry website targeting female young adults. I have had 1097 sessions this month but only 13 converted. I invested into a professional website, product photos, and models, and I have notice my sales go down since I have upgraded my website. I noticed I was getting more sales when my website looked unprofessional and no model photos. I had way more conversion in June and July compared to August. Do you think my website is up to par? Also shopify says my website is considered "slower" than related shops, with a score of 19.... Not sure what to do next.... Advice would be lovely, thank you! -Chas