Need Help: Some website are Categorizing my website under adult Section

Hello folks, I have an ecom website of lingerie, corsets, and other items. Business was good a few years back, then suddenly Google started deindexing my web pages, and to date, I haven't recovered from that. Currently, there are 7000+ pages indexed on Google, but in reality, I have more products than that that are not indexed. I am thinking that Google is considering my website is related to adult category, which is not. Generally, my website should be under the lingerie and swimsuits category. To be sure I checked my website category in other websites and one of those websites (https://www.cyren.com/security-center/url-category-check) said My website is under p0rn0gr@ph!c category. What do you guys think how should I deal with this issue?