Can not go wp-admin after change IP on VPS

I've made a VPS of Google Cloud Platform and use image
Screen Shot 2020-04-16 at 10.49.57 PM.png

But I've forgotten to change static IP so I used ephemeral external IP address. As you know, the IP has changed after a few day. So when I connect via new IP, the wordpress page keep using old IP to load content. It leads to the problems is the wordpress page not load correctly and can sign in wordpress admin
Screen Shot 2020-04-15 at 9.53.53 PM.png

I think it happened since I have lscache.

So How to fix it ? It was cache issue of lscache, how I can clear it via command line or something.?