Thanks in advance.
Sitecore 9+ by default the sites are secure only. Please try with https://sitecoreinstance93sc.dev.local
Couple of things can be verified with these issues:
C:\Windows\System32\drivers\etc\hosts you should see an entry for 127.0.0.1 sitecoreinstance93sc.dev.local
- Check the custom Site definition mostly located in the following path and ensure the hostName attribute C:\inetpub\wwwroot\yoursite\App_Config\Include\SiteDefinition.config