Website showing dangerous in the url box

I am looking for a skilled developer to help me with my e-commerce website. Recently, I have noticed that the URL box shows a "dangerous" message, which I believe is due to some security issues. My website has an SSL certificate installed, but I need an expert to help me solve this issue and ensure that my website is secure.

Ideal skills and experience:
- Strong knowledge of website security and SSL certificates
- Experience in troubleshooting and fixing security issues
- Familiarity with e-commerce websites and their unique security challenges