“This page includes other resources which are not secure.”
“The connection to this website is not fully secure because it contains unencrypted elements(such as images) or the encryption is not strong enough”
Try the below things.
Just give your website link in this website and check. It will list all the insecure URLs in your website.
In some cases, I have noted that the SSL warning comes only after you login, In that case, you cant use my first suggestion and you can use the chrome console as mentioned below
2. Using Chrome console
Load the site in google chrome -> Press F12 -> Select Console.
You can see the warning in red color that the mixed content should be replaced. Once you replace all those http links with https, your site should load fine.
Hope this helps 🙂