Hi @Basspig
checking your site there are three critical problems - https://check-your-website.server-daten.de/?q=ampexperts.com
First, you have mixed content -
link
stylesheet
http://fonts.googleapis.com/css?family=PT+Sans
1
http-link, change to https
Change that to https.
Second: You use only Tls.1.0, that's deprecated.
Browsers (Chrome, FF) will remove Tls.1.0 / 1.1 2020, so you should activate Tls.1.2.
Third, you are using old Cipher Suites with SHA1.
Easiest solution: There is a tool IISCrypto.
https://www.nartac.com/Products/IISCrypto/
Download that, then activate Tls.1.2 and check the Cipher Suites. May be enough, recheck your domain with the online tool.
A reboot is required.