After it got fully synched, I went to the information tab to see if finally there's an inbound connection; unfortunately, nothing changed while there are 10 outbound connections!

I've already tried the following things, but bitnodes still says "unreachable":

• Opened port 8333 ^{[both TCP and UDP]} on my router page.
• Added inbound rule for port 8333 on "Windows Defender Firewall with Advanced Security".
• A VPN with a static IP address.
• "Allow incoming connections" is checked ^{[bitcoin core]}.

Is there anything else that I could try?